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I would recommend to clear the Toolbox cache which is created by Visual Studio. The following steps will help you to do that:
- Close all Visual Studio instances;
- Open Windows Explorer and navigate to the directory %localappdata%\Microsoft\VisualStudio\[VS version]
- Make sure that the option 'Show hidden files...' is selected in the Windows Explorer options;
- Delete all *.tbd files;
- Start Visual Studio as Administrator and use the Toolbox Configurator wizard to set the required controls version. Please note that in order to make Telerik controls visible for .NET 4.0 Framework projects you should select .40 distribution from the distribution drop down list.
You can also get additional information on the Toolbox configuration wizard from the following link: LINK
Please let us know if we can further assist you.
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