RadEditor does not offer support for the requested feature out-of-the box and we do not support it.
The RadEditor commands are designed to be executed in Design mode only. Yes, you can enable the buttons icons using the setState method but this will not enable the Cut, Copy, Paste, Undo and Redo commands because the content area in Html mode is a textbox but the content area in Design mode is editable IFRAME.
You can get a reference to the textbox in HTML mode using the editor.get_textArea()
method and implement your own buttons and commands by enabling them when switching to HTML mode.
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