Could you elaborate more on the textarea you want to hide? In the onTADropDownSelect handler I see logic for showing/hiding only the Editor:
And this is the proper way of showing and hiding the Editor. However, I don't see a textarea element being accessed by its id, which makes me believe you could be talking to the Editor's editable area. The Editor is both the toolbar and the editable area below it. So please elaborate more on the textarea you want to show when "text/plain" is selected. If it is a separate element independent of the Editor, you can access it with jQuery: $("#MyTextareaId").hide()
And if by "textarea" you mean the Editor's editable area, do you want to show only it without the Editor's toolbar?
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