I am not sure I understand the observed issue correctly.
In case you are having troubles deleting content in RadRichTextBox and TextBox, please note that RadRichTextBox's implementation does not handle the backspace key and as far as we are aware MS TextBox does not either. Maybe the issue is related to the handlers for TextChanged event of the TextBox and KeyDown of the RadRichTextBox. Could you please provide us with more details on your application setup and if possible a simple sample, so that we can troubleshoot the issue on our side?
We're looking forward to your reply.
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