Except Map and scalebar all controls fail

[AshishArora]

Hi

I just installed 2.1 beta version of SilverLight API and created a new Silverlight Application Project in VS 2010. Except Map and Scalebar controls, none of the control is being added and every time fires an Error. (Please find the attached Error details).

[JenniferNery]

Thank you for your post.  We are aware of this issue in VisualStudio Design. 

Here's the work around, before you drag the elements to your Design, add a reference to this .NET assembly
System.Windows.Controls.Data.Input.