Thanks for contacting us.
Could you please give us more information about the issue you experience? A sample application that manages to reproduce this behavior would be of a great help since I will be able to thoroughly investigate the case. Please note that you will have to open a support ticket in order to be able to attach the project.
I also recommend you uninstall your current version, make sure that all assemblies from the Global Assembly Cache which names start with Telerik.WinControls.* and the assembly TelerikCommon are removed and after that start a new, fresh installation of RadContols for WinForms.
This may solve the
issue that you have experienced.
I hope this will help.
the Telerik team