Bug 417317 Error when running chart example SwingInteractivityViewer.java.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/InteractiveRenderer.java
return false;
	}
	public void modifyEvent( PrimitiveRenderEvent event )
	{
		if ( iun == null )
			return;
		restoreEvent( );
		String source = getSource( (StructureSource) event.getSource( ) );
		if ( source == null )
			return;
		Set<ActionType> typeSet = targets.get( source );
		if ( typeSet != null )
		{
			for ( Iterator<ActionType> iter = typeSet.iterator( ); iter.hasNext( ); )
			{
				ActionType type = iter.next( );
				switch ( type.getValue( ) )
				{
					case ActionType.HIGHLIGHT :
						highlight( event );
						break;
					case ActionType.TOGGLE_DATA_POINT_VISIBILITY :
						hideLabel( event );
						break;
					case ActionType.TOGGLE_VISIBILITY :
						hideElement( event );
						break;
				}
			}
		}