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
private List scripts = new Vector( );
	/**
	 * Element that represents the hot spot layer
	 */
	protected Element hotspotLayer;
	private Map componentPrimitives = new Hashtable( );
	private IUpdateNotifier _iun;
	private static ILogger logger = Logger.getLogger( "org.eclipse.birt.chart.device.svg/trace" ); 
	SVGGraphics2D svg_g2d;
	private ULocale locale;
	private List cacheEvents = new ArrayList( );
	public SVGInteractiveRenderer( ULocale locale )
	{
		if ( locale == null )
			this.locale = ULocale.getDefault( );
		else
			this.locale = locale;
	}
	public void setIUpdateNotifier( IUpdateNotifier iun )
	{
		this._iun = iun;
	}
	public void setSVG2D( SVGGraphics2D svg2D )
	{
		this.svg_g2d = svg2D;
	}
	/**
	 * Groups the svg drawing instructions that represents this primitive
	 * events. Each group is assigned an id that identifies the source object of
	 * the primitive event