hi,   i am trying to rewrite a mind-mapping program (kdissert/semantik) in drscheme and then make it more flexible.     what the application will need is a canvas with a lot of boxes with text in them and edges connecting the boxes. occasionally i will need an text-editor snip, to create a new box of text or edit an existing one. and, the boxes of text need to be draggable.  MrEd, right now has two types of editors - text and pastebox, and both dont seem to support drawing operations. I am writing to ask if anyone has implemented a canvas editor so far. or maybe, there is some other way to implement this functionality? i tried drawing a text-editor snip directly onto the dc of a canvas using draw, but that didn't seem to work. harsha.    screenshots :    <a href="http://freehackers.org/~tnagy/kdissert.html">http://freehackers.org/~tnagy/kdissert.html</a>    <a href="http://www.esnips.com/doc/824f6991-2909-4592-8542-77761a04cedf/Screenshot-1"> http://www.esnips.com/doc/824f6991-2909-4592-8542-77761a04cedf/Screenshot-1</a>    (there is an option to view at original size)