What you should do is that, when form 'A' is loaded, then you wish to load form 'B', on the click event of that button that you use to load the form 'B', before your command to load the form. Add this line "THISFORM.ALWAYSONTOP = .F." this will prevent form 'A' to activate while form 'B' is loaded.

I hope i got your problem right.
Hope this will help you! :)