Fabio,
If understood Naomi correctly, she wants a shape from one form to have the same background color of a pageframe on another form, so they look similar. And now that I put it this way, Nadia, why don't you replace the shape with a 1 page tabless pageframe?
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges