create a MDIform Test(
Height = 1000
width = 2000)


Create a form TestChild(Property MDICHIld=TRUE)
set Height = 3000
width = 5000

MDIForm is the main form
call the child form from MDIFORM
set x as new TestChild
x.show

In the TestCHild Load event put this code
MSgbox me.height

see the value i want it to be 3000.
I cant hardcode it