The decision about which Hide and Show, will be linked is taken at runtime (as the declaration of method virtual being virtual prohibits compiler to link statically the method leaving this link unresolved).
Ang desisyon tungkol sa kung aling Itago at Show, ay naka-link ay nasakop sa lahat runtime (bilang ang deklarasyon ng paraan virtual pagiging virtual nagbabawal compiler na mag-link statically ang paraan umaalis ang link na hindi malutas).