Button to edit raw text

[spiffytech]

I've got an mdx content area with some content components.

Sometimes I need to do something that's tricky or not possible through the UI[1]. It'd be handy to just edit the raw text, then flip back to the WYSIWYG editor.

[1] Like wrapping a component in another component (cut/paste fun), or adding text to the front of the document when I can't get the cursor ahead of the component that's at the front of the document (not possible)