when I try to use the style below to style the date picker I get the error

 "The type primitives:DatePickerTextBox was not found."

i have the local namespace declared but i can find no documentation on the primitives namespace.  any ideas?  i'm using the style XAML below from this link :  http://msdn.microsoft.com/en-us/library/cc278067(VS.95).aspx  unfortuneately there is no information about the primitives namespace there.

<Style TargetType="local:DatePicker">
    <Setter Property="IsTabStop" Value="False"/>
    <Setter Property="Background" Value="#FFFFFFFF" />
    <Setter Property="Padding" Value="2"/>
    <Setter Property="SelectionBackground" Value="#FF444444"/>
    <Setter Property="BorderBrush">
        <Setter.Value>
            <LinearGradientBrush EndPoint=".5,0" StartPoint=".5,1">
                <GradientStop Color="#FFA3AEB9" Offset="0"/>
                <GradientStop Color="#FF8399A9" Offset="0.375"/>
                <GradientStop Color="#FF718597" Offset="0.375"/>
                <GradientStop Color="#FF617584" Offset="1"/>
            </LinearGradientBrush>
        </Setter.Value>
    </Setter>
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local:DatePicker">
                <Grid x:Name="Root">
                        <Grid.Resources>
                            <!-- Main DatePicker Brushes -->
                            <SolidColorBrush x:Key="DisabledBrush" Color="#A5FFFFFF" />

                            <!-- Button Template -->
                            <ControlTemplate x:Key="DropDownButtonTemplate" TargetType="Button">
                                <Grid>
                                    <vsm:VisualStateManager.VisualStateGroups>
                                        <vsm:VisualStateGroup x:Name="CommonStates">
                                            <vsm:VisualStateGroup.Transitions>
                                                <vsm:VisualTransition GeneratedDuration="0" />
                                                <vsm:VisualTransition To="MouseOver" GeneratedDuration="0:0:0.1" />
                                                <vsm:VisualTransition To="Pressed" GeneratedDuration="0:0:0.1" />
                                            </vsm:VisualStateGroup.Transitions>
                                            <vsm:VisualState x:Name="Normal" />
                                            <vsm:VisualState x:Name="MouseOver">
                                                <Storyboard>
                                                    <ColorAnimation Duration="0" Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" To="#FF448DCA"/>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#7FFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#CCFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </vsm:VisualState>
                                            <vsm:VisualState x:Name="Pressed">
                                                <Storyboard>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#FF448DCA"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="Highlight" Storyboard.TargetProperty="(UIElement.Opacity)">
                                                        <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
                                                    </DoubleAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#EAFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#C6FFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#6BFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#F4FFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </vsm:VisualState>
                                            <vsm:VisualState x:Name="Disabled">
                                                <Storyboard>
                                                    <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="(UIElement.Opacity)">
                                                        <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
                                                    </DoubleAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </vsm:VisualState>
                                        </vsm:VisualStateGroup>
                                    </vsm:VisualStateManager.VisualStateGroups>

                                    <!--Start UI-->
                                    <Grid Height="18" Width="19" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0" Background="#11FFFFFF">
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="20*"/>
                                            <ColumnDefinition Width="20*"/>
                                            <ColumnDefinition Width="20*"/>
                                            <ColumnDefinition Width="20*"/>
                                        </Grid.ColumnDefinitions>
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="23*"/>
                                            <RowDefinition Height="19*"/>
                                            <RowDefinition Height="19*"/>
                                            <RowDefinition Height="19*"/>
                                        </Grid.RowDefinitions>
                                        <Border Margin="-1" Grid.ColumnSpan="4" Grid.Row="0" Grid.RowSpan="4" BorderThickness="1" BorderBrush="#FF45D6FA" Opacity="0" CornerRadius="0,0,1,1" x:Name="Highlight"/>
                                        <Border x:Name="Background" Margin="0,-1,0,0" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" BorderThickness="1" BorderBrush="#FFFFFFFF" Opacity="1" CornerRadius=".5" Background="#FF1F3B53"/>
                                        <Border x:Name="BackgroundGradient" Margin="0,-1,0,0" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" BorderThickness="1" BorderBrush="#BF000000" Opacity="1" CornerRadius=".5">
                                            <Border.Background>
                                                <LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
                                                    <GradientStop Color="#FFFFFFFF" Offset="0" />
                                                    <GradientStop Color="#F9FFFFFF" Offset="0.375" />
                                                    <GradientStop Color="#E5FFFFFF" Offset="0.625" />
                                                    <GradientStop Color="#C6FFFFFF" Offset="1" />
                                                </LinearGradientBrush>
                                            </Border.Background>
                                        </Border>
                                        <Rectangle Grid.ColumnSpan="4" Grid.RowSpan="1" StrokeThickness="1">
                                            <Rectangle.Stroke>
                                                <LinearGradientBrush EndPoint="0.48,-1" StartPoint="0.48,1.25">
                                                    <GradientStop Color="#FF494949"/>
                                                    <GradientStop Color="#FF9F9F9F" Offset="1"/>
                                                </LinearGradientBrush>
                                            </Rectangle.Stroke>
                                            <Rectangle.Fill>
                                                <LinearGradientBrush EndPoint="0.3,-1.1" StartPoint="0.46,1.6">
                                                    <GradientStop Color="#FF4084BD"/>
                                                    <GradientStop Color="#FFAFCFEA" Offset="1"/>
                                                </LinearGradientBrush>
                                            </Rectangle.Fill>
                                        </Rectangle>
                                        <Path HorizontalAlignment="Center" Margin="4,3,4,3" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5" Grid.Column="0" Grid.Row="1" Fill="#FF2F2F2F" Stretch="Fill" Data="M11.426758,8.4305077 L11.749023,8.4305077 L11.749023,16.331387 L10.674805,16.331387 L10.674805,10.299648 L9.0742188,11.298672 L9.0742188,10.294277 C9.4788408,10.090176 9.9094238,9.8090878 10.365967,9.4510155 C10.82251,9.0929432 11.176106,8.7527733 11.426758,8.4305077 z M14.65086,8.4305077 L18.566387,8.4305077 L18.566387,9.3435936 L15.671368,9.3435936 L15.671368,11.255703 C15.936341,11.058764 16.27293,10.960293 16.681133,10.960293 C17.411602,10.960293 17.969301,11.178717 18.354229,11.615566 C18.739157,12.052416 18.931622,12.673672 18.931622,13.479336 C18.931622,15.452317 18.052553,16.438808 16.294415,16.438808 C15.560365,16.438808 14.951641,16.234707 14.468243,15.826504 L14.881817,14.929531 C15.368796,15.326992 15.837872,15.525723 16.289043,15.525723 C17.298809,15.525723 17.803692,14.895514 17.803692,13.635098 C17.803692,12.460618 17.305971,11.873379 16.310528,11.873379 C15.83071,11.873379 15.399232,12.079271 15.016094,12.491055 L14.65086,12.238613 z" Grid.ColumnSpan="4" Grid.RowSpan="3"/>
                                        <Ellipse HorizontalAlignment="Center" VerticalAlignment="Center" Fill="#FFFFFFFF" StrokeThickness="0" Grid.ColumnSpan="4" Width="3" Height="3"/>
                                        <Border Grid.ColumnSpan="4" Grid.Row="0" Grid.RowSpan="4" BorderThickness="1" BorderBrush="#B2FFFFFF" Opacity="0" CornerRadius="0,0,.5,.5" x:Name="DisabledVisual"/>
                                    </Grid>
                                    <!--End UI-->
                                </Grid>
                            </ControlTemplate>
                        </Grid.Resources>
                        <vsm:VisualStateManager.VisualStateGroups>
                            <vsm:VisualStateGroup x:Name="CommonStates">
                                <vsm:VisualState x:Name="Normal" />
                                <vsm:VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="Opacity" To="1" Duration="0" />
                                    </Storyboard>
                                </vsm:VisualState>
                            </vsm:VisualStateGroup>
                        </vsm:VisualStateManager.VisualStateGroups>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <primitives:DatePickerTextBox x:Name="TextBox" SelectionBackground="{TemplateBinding SelectionBackground}" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Column="0" />
                        <Button x:Name="Button" Template="{StaticResource DropDownButtonTemplate}" Grid.Column="1" Width="20" Foreground="{TemplateBinding Foreground}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Margin="3,0,3,0"/>
                        <Grid x:Name="DisabledVisual" Opacity="0" IsHitTestVisible="False" Grid.ColumnSpan="2">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Rectangle RadiusX="1" RadiusY="1" Fill="#A5FFFFFF" Grid.Column="0"/>
                            <Rectangle RadiusX="1" RadiusY="1" Fill="#A5FFFFFF" Grid.Column="1" Height="18" Width="19" Margin="3,0,3,0" />
                        </Grid>
                        <Popup x:Name="Popup"/>
                    </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Try this out.... 

Required Namespaces:

xmlns:basics="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"

xmlns:System_Windows_Controls_Primitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls">

Style:

<Style x:Key="DatePickerStyle1" TargetType="basics:DatePicker">
 <Setter Property="IsTabStop" Value="False"/>
 <Setter Property="Background" Value="#FFFFFFFF"/>
 <Setter Property="Padding" Value="2"/>
 <Setter Property="SelectionBackground" Value="#FF444444"/>
 <Setter Property="BorderBrush">
  <Setter.Value>
   <LinearGradientBrush EndPoint=".5,0" StartPoint=".5,1">
    <GradientStop Color="#FF617584" Offset="0"/>
    <GradientStop Color="#FF718597" Offset="0.375"/>
    <GradientStop Color="#FF8399A9" Offset="0.375"/>
    <GradientStop Color="#FFA3AEB9" Offset="1"/>
   </LinearGradientBrush>
  </Setter.Value>
 </Setter>
 <Setter Property="BorderThickness" Value="1"/>
 <Setter Property="Template">
  <Setter.Value>
   <ControlTemplate TargetType="basics:DatePicker">
    <Grid x:Name="Root">
     <Grid.Resources>
      <SolidColorBrush x:Key="DisabledBrush" Color="#8CFFFFFF"/>
      <ControlTemplate x:Key="DropDownButtonTemplate" TargetType="Button">
       <Grid>
        <vsm:VisualStateManager.VisualStateGroups>
         <vsm:VisualStateGroup x:Name="CommonStates">
          <vsm:VisualStateGroup.Transitions>
           <vsm:VisualTransition GeneratedDuration="0"/>
           <vsm:VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver"/>
           <vsm:VisualTransition GeneratedDuration="0:0:0.1" To="Pressed"/>
          </vsm:VisualStateGroup.Transitions>
          <vsm:VisualState x:Name="Normal"/>
          <vsm:VisualState x:Name="MouseOver">
           <Storyboard>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#7FFFFFFF"/>
            </ColorAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#CCFFFFFF"/>
            </ColorAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF"/>
            </ColorAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#FF448DCA"/>
            </ColorAnimationUsingKeyFrames>
           </Storyboard>
          </vsm:VisualState>
          <vsm:VisualState x:Name="Pressed">
           <Storyboard>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#FF448DCA"/>
            </ColorAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="Highlight" Storyboard.TargetProperty="(UIElement.Opacity)">
             <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#EAFFFFFF"/>
            </ColorAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#C6FFFFFF"/>
            </ColorAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#6BFFFFFF"/>
            </ColorAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)">
             <SplineColorKeyFrame KeyTime="0" Value="#F4FFFFFF"/>
            </ColorAnimationUsingKeyFrames>
           </Storyboard>
          </vsm:VisualState>
          <vsm:VisualState x:Name="Disabled">
           <Storyboard>
            <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="(UIElement.Opacity)">
             <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
           </Storyboard>
          </vsm:VisualState>
         </vsm:VisualStateGroup>
        </vsm:VisualStateManager.VisualStateGroups>
        <Grid Height="18" HorizontalAlignment="Center" Margin="0" VerticalAlignment="Center" Width="19" Background="#11FFFFFF">
         <Grid.RowDefinitions>
          <RowDefinition Height="23*"/>
          <RowDefinition Height="19*"/>
          <RowDefinition Height="19*"/>
          <RowDefinition Height="19*"/>
         </Grid.RowDefinitions>
         <Grid.ColumnDefinitions>
          <ColumnDefinition Width="20*"/>
          <ColumnDefinition Width="20*"/>
          <ColumnDefinition Width="20*"/>
          <ColumnDefinition Width="20*"/>
         </Grid.ColumnDefinitions>
         <Border Margin="-1" x:Name="Highlight" Opacity="0" Grid.ColumnSpan="4" Grid.Row="0" Grid.RowSpan="4" BorderBrush="#FF6DBDD1" BorderThickness="1" CornerRadius="0,0,1,1"/>
         <Border Margin="0,-1,0,0" x:Name="Background" Opacity="1" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" Background="#FF1F3B53" BorderBrush="#FFFFFFFF" BorderThickness="1" CornerRadius=".5"/>
         <Border Margin="0,-1,0,0" x:Name="BackgroundGradient" Opacity="1" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" BorderBrush="#BF000000" BorderThickness="1" CornerRadius=".5">
          <Border.Background>
           <LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
            <GradientStop Color="#FFFFFFFF" Offset="0"/>
            <GradientStop Color="#F9FFFFFF" Offset="0.375"/>
            <GradientStop Color="#E5FFFFFF" Offset="0.625"/>
            <GradientStop Color="#C6FFFFFF" Offset="1"/>
           </LinearGradientBrush>
          </Border.Background>
         </Border>
         <Rectangle Grid.ColumnSpan="4" Grid.RowSpan="1" StrokeThickness="1">
          <Rectangle.Stroke>
           <LinearGradientBrush EndPoint="0.48,-1" StartPoint="0.48,1.25">
            <GradientStop Color="#FF494949"/>
            <GradientStop Color="#FF9F9F9F" Offset="1"/>
           </LinearGradientBrush>
          </Rectangle.Stroke>
          <Rectangle.Fill>
           <LinearGradientBrush EndPoint="0.3,-1.1" StartPoint="0.46,1.6">
            <GradientStop Color="#FF4084BD"/>
            <GradientStop Color="#FFAFCFEA" Offset="1"/>
           </LinearGradientBrush>
          </Rectangle.Fill>
         </Rectangle>
         <Path HorizontalAlignment="Center" Margin="4,3,4,3" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5" Grid.Column="0" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" Fill="#FF2F2F2F" Stretch="Fill" Data="M11.426758,8.4305077 L11.749023,8.4305077 L11.749023,16.331387 L10.674805,16.331387 L10.674805,10.299648 L9.0742188,11.298672 L9.0742188,10.294277 C9.4788408,10.090176 9.9094238,9.8090878 10.365967,9.4510155 C10.82251,9.0929432 11.176106,8.7527733 11.426758,8.4305077 z M14.65086,8.4305077 L18.566387,8.4305077 L18.566387,9.3435936 L15.671368,9.3435936 L15.671368,11.255703 C15.936341,11.058764 16.27293,10.960293 16.681133,10.960293 C17.411602,10.960293 17.969301,11.178717 18.354229,11.615566 C18.739157,12.052416 18.931622,12.673672 18.931622,13.479336 C18.931622,15.452317 18.052553,16.438808 16.294415,16.438808 C15.560365,16.438808 14.951641,16.234707 14.468243,15.826504 L14.881817,14.929531 C15.368796,15.326992 15.837872,15.525723 16.289043,15.525723 C17.298809,15.525723 17.803692,14.895514 17.803692,13.635098 C17.803692,12.460618 17.305971,11.873379 16.310528,11.873379 C15.83071,11.873379 15.399232,12.079271 15.016094,12.491055 L14.65086,12.238613 z"/>
         <Ellipse Height="3" HorizontalAlignment="Center" VerticalAlignment="Center" Width="3" Grid.ColumnSpan="4" Fill="#FFFFFFFF" StrokeThickness="0"/>
         <Border x:Name="DisabledVisual" Opacity="0" Grid.ColumnSpan="4" Grid.Row="0" Grid.RowSpan="4" BorderBrush="#B2FFFFFF" BorderThickness="1" CornerRadius="0,0,.5,.5"/>
        </Grid>
       </Grid>
      </ControlTemplate>
     </Grid.Resources>
     <vsm:VisualStateManager.VisualStateGroups>
      <vsm:VisualStateGroup x:Name="CommonStates">
       <vsm:VisualState x:Name="Normal"/>
       <vsm:VisualState x:Name="Disabled">
        <Storyboard>
         <DoubleAnimationUsingKeyFrames Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="Opacity">
          <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
         </DoubleAnimationUsingKeyFrames>
        </Storyboard>
       </vsm:VisualState>
      </vsm:VisualStateGroup>
     </vsm:VisualStateManager.VisualStateGroups>
     <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*"/>
      <ColumnDefinition Width="Auto"/>
     </Grid.ColumnDefinitions>
     <System_Windows_Controls_Primitives:DatePickerTextBox x:Name="TextBox" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Column="0" SelectionBackground="{TemplateBinding SelectionBackground}"/>
     <Button Margin="2,0,2,0" x:Name="Button" Width="20" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Foreground="{TemplateBinding Foreground}" Template="{StaticResource DropDownButtonTemplate}" Grid.Column="1"/>
     <Grid x:Name="DisabledVisual" IsHitTestVisible="False" Opacity="0" Grid.ColumnSpan="2">
      <Grid.ColumnDefinitions>
       <ColumnDefinition Width="*"/>
       <ColumnDefinition Width="Auto"/>
      </Grid.ColumnDefinitions>
      <Rectangle Fill="#8CFFFFFF" RadiusX="1" RadiusY="1"/>
      <Rectangle Height="18" Margin="2,0,2,0" Width="19" Grid.Column="1" Fill="#8CFFFFFF" RadiusX="1" RadiusY="1"/>
     </Grid>
     <Popup x:Name="Popup"/>
    </Grid>
   </ControlTemplate>
  </Setter.Value>
 </Setter>
</Style>

Please "Mark as Answer" if this post answered your question. :)

System.Windows.Controls.Data and System.Windows.Controls

Use Nameapaces

xmlns:Local="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls.Data"

thanks
Prasad Bhalekar (PP)
Please "Mark as Answer" if any of my content helped resolve the issue

adding

xmlns:primitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls"

makes it work at runtime but now my designer is blank due to a bug in VS2008.  hopefully they fix that soon that is annoying.

thanks
Prasad Bhalekar (PP)
Please "Mark as Answer" if any of my content helped resolve the issue