I will follow up on your issue in this thread as well, in case anyone else in the community encounters similar issues:
Basically our investigation showed that the issue can only be reproduced on a single computer and setting the RenderOptions.ProcessRenderMode
fixes the problem. This makes us believe that the rendering issue that only comes up during the resizing process of the window is caused by external issues like the machine setup and its graphic settings.
All the best,
the Telerik team
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