+#if TARGET_API_MAC_OSX
+static void InvalidateControlAndChildren( HIViewRef control )
+{
+ HIViewSetNeedsDisplay( control , true ) ;
+ UInt16 childrenCount = 0 ;
+ OSStatus err = CountSubControls( control , &childrenCount ) ;
+ if ( err == errControlIsNotEmbedder )
+ return ;
+ wxASSERT_MSG( err == noErr , wxT("Unexpected error when accessing subcontrols") ) ;
+
+ for ( UInt16 i = childrenCount ; i >=1 ; --i )
+ {
+ HIViewRef child ;
+ err = GetIndexedSubControl( control , i , & child ) ;
+ if ( err == errControlIsNotEmbedder )
+ return ;
+ InvalidateControlAndChildren( child ) ;
+ }
+}
+#endif
+