If you've installed the Silverlight Tools for Visual Studio 2008 , you may have noticed that pressing F1 in the VS Code Editor or in XAML View can take you someplace unexpected. You'll see this with types and members that are "shared"
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Read the complete post at http://blogs.msdn.com/silverlight_sdk/archive/2008/11/22/silverlight-toolkit-and-f1-help.aspx