Couple of years ago I used C++ Builder to draw GUI (WYSIWYG) and had hooks to my scripts from there.

After time passed I refused of this approach due to lack of supported OSes.
(no support for WinCE, which I very like to use)

Now I use Perl and Tcl/Tk simultaneously (Tcl/Tk only for GUI) and happy with that, because I have:

• WYSIWYG IDE (I mean http://vtcl.sf.net)
• crossplatform (I use Linux, Win32, WinCE)
• powerfull Text and Canvas widgets, which I really appresiate