I don't know wxWidgets, but if it just hosts an IE or FF shell, then it should work but if its a private HTML browser implementaiton, it won't know what to do with the object tag. YOu could augment it to support it, but it wouldn't be trivial. Does it support Flash?
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Shawn Wildermuth
C# MVP, MCSD, Speaker and Author
Silverlight 2 Workshop
May 12-14, 2008 - Atlanta, GA
May 28-30, 2008 - San Francisco, CA
http://www.silverlight-tour.com