Brew MP 1.0.2
This function allows a form to remove itself from the top of the root form's form
stack -- a task that normally is the responsibility of the root form itself. The
form will be removed from the form stack only if it is currently the topmost form
on the stack, otherwise, the function returns without affecting the form stack at
[in] Pointer to the form to be popped off of the form stack -- but only if that
form is also the form at the top of the stack.