Hi pratik mehta,
Our Silverlight controls can run on both Silverlight 3 and Silverlight 4. However, starting with version Q2, we will no longer ship SL3 versions of our controls.
So, you can use the SL3 version of our Silverlight Q1 SP2 with Visual Studio 2008. However, for SL4 binaries and our next versions, you need Visual Studio 2010, both on your dev machines and on your build machines.
In short, if you wish to use Silverlight 4, then you need to have VS10. Do note, however, that this restriction is not imposed by Telerik, but rather by Microsoft, because Visual Studio 2008 does not support Silverlight 4.
the Telerik team
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