Thank you for contacting us.
This issue appears when Visual Studio
can not resolve the Telerik.WinControls.UI.Design
assembly which contains all control designers for our components. This assembly is added to the GAC when installing RadControls for WinForms
. You have the following options to solve the issue:
You can add this assembly in the GAC manually. It should be located in the bin folder where you installed RadControls for WinForms
You can add reference to this assembly in your application.
You can try reinstalling RadControls for WinForms
I hope this helps. If you need further assistance, I will be glad to help.
the Telerik team
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