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Telerik AJAX components appear multiple times in Visual Studio 2010 toolbox

PROBLEM
All the tools in the toolbox show up multiple times. This makes it very hard to scroll through them.

SOLUTION
This is a common problem in Visual Studio 2010, which is fixed in the newer versions.

In order to resolve it in VS 2010, clear the Toolbox cache created by the Visual Studio.

The following steps will help you to achieve this:

  1. Close all Visual Studio instances.

  2. Open Windows Explorer and navigate to the directory %localappdata%\Microsoft\VisualStudio\10.0

  3. Make sure that the option Show hidden files, folders and drives is selected in the Windows Explorer options.

  4. Delete all *.tbd files.

  5. Start Visual Studio 2010 and use the Toolbox Configurator wizard to set the required controls version.

In case this does not help, try to completely reset your Visual Studio Toolbox, as it is described below:

  1. Close all Visual Studio instances.
  2. Could you please check if the Visual Studio Toolbox has created again the *.tbd files and delete them if they exist?
  3. Start the regedit.exe tool, find the following registry keys:
    • HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\10.0\ToolboxControlsInstaller_AssemblyFoldersExCache
    • HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\10.0\ToolboxControlsInstallerCache
  4. Remove everything from these keys and leave them empty.
  5. Run Visual Studio again, wait until it recreates all the items in the Toolbox and then use the Toolbox Configurator once again to populate the appropriate UI for ASP.NET AJAX version in the VS Toolbox.
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