Thanks for writing.
1. Update 2 for Visual Studio 2012 now officially addresses this issue. Can you please try to install it and see of it works for you.
2. Even if you do not want to install Update 2 for Visual Studio 2012, we have introduced some upgrades in our Styles structure that address this limitation and you should be able to extract the templates of all controls via the Visual Studio designer.
I hope this helps.
All the best,
the Telerik team
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