combineTwoP :: (LayoutClass super(), LayoutClass l1 Window, LayoutClass l2 Window) =>
                super () -> l1 Window -> l2 Window -> Property -> CombineTwoP (super ()) l1 l2 Window
combineTwoP = C2P [] [] []
combineTwoP :: (LayoutClass super(), LayoutClass l1 Window, LayoutClass l2 Window) =>
                super () -> l1 Window -> l2 Window -> Property -> CombineTwoP (super ()) l1 l2 Window
combineTwoP = C2P [] [] []
combineTwoP = C2P [] [] []