Shift-Tab binding

Hi,

Is there a way to bind <Shift-Tab> shortcut to make it work as I want
and not as default? (it switches focus back to previous widget).

I tried to use it with [text] widget like this:

bind .frm.txt <Shift-Tab> "my_proc; break"

but it doesn't call [my_proc] - it switches back to previous widget.
Any ideas?

--
Pozdrawiam (Regards)!
Googie
.