First of all, thank you for your interest in the RadRichTextBox control.
Now, straight to your question - in order to remove the Border which gets visible in the MouseOver state, you can set the MouseOverBorderThickness
property of the RadRichTextBox to "0
" as follows:
The other option that you have is to override the RadRichTextBox template
and there you can define your own custom appearance of the control and its states.
I hope this helps.
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