>I tried put this in the button (of the mainmenu form) and didn't work right

But what did it do?

You could also create a somethig like this: All of your forms are really just container classes. You're Main form has a pageframe with no border two pages and the Tabs property = .f. Then, when ever you click a button, lock the screen, add the class you need to the second frame and make it active. Then, when done witht eh "form", remove the object and return back to the first page.

This would be a disaster in a large app because of teh datasessoin thing, but it sounds like the app may be small because you are using only Modal forms for processes int he first place?