In our project we were using Dev tools release Q2 2011 till now. We upgraded to Q2 2012(DLL's for Silverlight) RadControls_for_Silverlight4_2012_2_0607_DEV_hotfix.
initially we got an error: "The type or namespace
name 'Charting' does not exist in the namespace 'Telerik.Windows.Controls' "
We resolved it by using following method:
1. Added reference to Telerik.Windows.Controls.Chart.dll.
2. Replaced namespace Telerik.Windows.Controls.Charting with Telerik.Charting
But now we are getting the following errors:
"The type or namespace name 'ChartArea' could not be found (are you missing a using directive or an assembly reference?)"
"The type or namespace name 'ChartDataBoundEventArgs' could not be found (are you missing a using directive or an assembly reference?)"