Thank you for contacting us with this question.
The easiest way to do this would be to attach your custom handler to the PreviewEditorKeyDown event of the RadRichTextBox. The code would look similar to this:
sender, Telerik.Windows.Documents.PreviewEditorKeyEventArgs e)
((Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)) && Keyboard.IsKeyDown(Key.F))
You can read a bit more about the keyboard support offered by the RadRichTextbox here
We hope that you are enjoying your experience with the RadRichTextBox so far. If you have any further questions, please, don't hesitate to ask.
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