Bug 134632 SVG chart visibility interaction does not work correctly.
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGInteractiveRenderer.java
final Chart cmDT = _iun.getDesignTimeModel( );
		if ( cmDT instanceof ChartWithAxes )
		{
			return (Series) ( (SeriesDefinition) ( (ChartWithAxes) cmDT ).getBaseAxes( )[0].getSeriesDefinitions( )
					.get( 0 ) ).getSeries( ).get( 1 );
		}
		else
		{
			return (Series) ( (SeriesDefinition) ( (ChartWithoutAxes) cmDT ).getSeriesDefinitions( )
					.get( 0 ) ).getSeries( ).get( 1 );
		}
	}
	/**
	 * Prepare event handling
	 */
	public void prepareInteractiveEvent( Element elm, InteractionEvent ie,
			Trigger[] triggers )
	{
		
		cacheEvents.add( new CacheEvent( elm,
				ie.getStructureSource( ),
				triggers ) );
	}
	/**
	 * Process events that have been prepared and apply them to the SVG Elements
	 */
	public void addInteractivity( )
	{
		for ( Iterator iter = cacheEvents.iterator( ); iter.hasNext( ); )
		{