When you're using NoXaml assemblies, you should merge separately the needed xaml files, please check the following article for more details - Implicit Styles
We've tested Q1 2013 version in the Visual Studio 2013 RC and the controls are shown in the designer without a problem at our side. Have you tried to delete bin
folders and then rebuild the solution?
Also have you installed the controls or you're using the zip file? Please make sure that the folder from where you've referenced the Telerik assemblies contains the design
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