question: public void initToolTip ( ) { if ( ttmanager == null ) { ttmanager = ToolTipManager . sharedInstance ( ) ; ttmanager . registerComponent ( map ) ; ttmanager . setEnabled ( true ) ; return ; } if ( map != null ) { map . setToolTipText ( null ) ; } }
target:  This method should be called to initialize the tooltip status so that an old tooltip doesn't remain when a layer starts listening to mouse events.