This method is called when a MDI_MSG_MAXIMIZE_VIEW message is received, but it can also
be called directly. When a MDI view is maximized, its first child replaces the MDIClient view
in the view hierarchy and the client view is hidden. The MDI view displays a button right
of the key-menubar of its window which restores the maximized view. If you call this function
when a view is maximized the passed view replaces the currenctly maximized view. If you
pass NULL as 'view' the currently maximized view is restored, but no additional actions
(like updating the scroller or updating the clipping) are taken. In order to restore
the currently maximized view call 'RestoreView'.
CMDIClientView
