If I understand you, you want to swtich between forms inside the VFP application? If so you will need to ensure that something, somewhere, is holding an object reference to all active forms (i.e. a "Form Manager" object).
Then all you have to d is have the currently active form call the Form Manager and tell it to activate the required form. You can probably find examples of Form Manager on line, but if not, I can send you one that I have used
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Andy Kramek
Visual FoxPro MVP