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Suppose you write code for the Click event of a button and you need a reference to a window's MDI Frame, if it exists. The code below will get that reference. If the MDI frame does not exist, the variable Parent will return @window instead of the MDI frame reference.

 
Code Block
Parent = @window
Frame = Get_Property(Parent, "MDIFRAME")
if len(Frame) then
  Parent = Frame
end