I'm getting an error trying to build a Silverlight application on a new machine. (Silverlight 4, Visual Studio 2010) This application compiles without error on four other machines.

The error is:

the tag 'MenuItem' does not exist in XML namespace 'clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit'.

The references appear to be pointer to the correct assemblies. Has anyone else ever had this problem?

xaml silverlight-4.0 silverlight-toolkit silverlight-5.0
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