What is the difference between IDynPicture and DynPicture? 8.0RT Normal,8.2RT ERROR

What is the difference between IDynPicture and DynPicture? 8.0RT Normal,8.2RT ERROR

Public Screen As zenOn.IDynPicture

Private Sub zScreen_W(ByVal obDynPicture As IDynPicture)
      Set Screen = obDynPicture            'ERROR
End Sub

' Why does 8.0RT not report an error and 8.2RT report an error?


'The same like IVariable and Variable.