Thank you for contacting us!
I can see from the snapshot you attached that you are using RadDocking and I presume RadRichTextBox is placed in a pane. However, we are having a hard time reproducing the behavior you are experiencing. Could you please open a support ticket and send us a sample working project? This will be the fastest way to investigate the problem and try to provide a solution.
Thank you in advance. I'm looking forward to your reply.
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