Here are a couple of links about the issues with detecting when a control is design mode (within Expression Blend or Visual Studio):
- http://blogs.sqlxml.org/bryantlikes/archive/2009/02/25/detecting-design-mode-in-silverlight.aspx
- http://blogs.msdn.com/delay/archive/2009/02/26/designerproperties-getisindesignmode-forrealz-how-to-reliably-detect-silverlight-design-mode-in-blend-and-visual-studio.aspx
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