corrected hiding/showing of native mac controls

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9440 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/control.h

@@ -103,6 +103,7 @@ protected:
 protected:
    // For controls like radiobuttons which are really composite
 	ControlHandle		m_macControl ;
+	bool				m_macControlIsShown ;
    	wxList m_subControls;
 	int							m_macHorizontalBorder ;
 	int							m_macVerticalBorder ;