Hello Wolfgang Kaiser,
I am sending you a .reg file which will add our controls to the Visual studio toolbox. Once the file is executed it will create the needed registry entries. Before running the file you should probably edit it to see if all file path are correct.
Also, it will be a good idea to check if those entries haven't been added already. The registry path where those entries are added is "[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\10.0\ToolboxControlsInstaller". If you see child registry entries similar to "Telerik.Windows.Controls.MediaPlayer" then our controls were added to the toolbox and there might be some problem with the toolbox itself. If that's the case you might try resetting the toolbox.
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