We are not aware of such an issue with the current version of RadGridView. May I ask you to perform the following steps:
1. Open the project and remove all Telerik's references.
2. Save the project and close it.
3. Open the project directory and delete "Bin" and "Obj" folders.
4. Open the project and add the references.
5. Build the project.
Sometimes this helps to resolve the designer's errors and I hope that in your case will be that way.
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