How to bring up a tk form in EDI?

Hi all,

I wish to add a GUI to my hand-crafted tcl procedures, but I cannot figure out how to bring up the tk form in SOC encounter. Yes, I can see "pack" command under EDI shell, but it turns out to be in-effective.

For a very simple example:

   button .btn1 "Button"
   pack .btn1

can create a form with one button under wish shell, but nothing happens under EDI shell. Can you help me how to deal with it? Or can i use something else to build up my own GUI?

Thank You,
Robin  :)