showmodal problems (again!)

Please can anyone help me with this one ?

I have several forms all called using showmodal from a
main controlling form.
Each one works fine until the one displaying the progress bar
which appears fine on my machine, but if I install it on
another then the form is resized automatically so that half of the
components are out of sight.

I've tried changing every property under the sun, but I still can't get
it to work.

Anyone got any ideas ?

P.S. There's a pint in it for the first correct answer!

Cheers

---
Ian Whitcombe