Bug 214254 Expose Javascript "event" object for interactivity
When doing interactivity with a chart, and specifying a Mouse Click event with an Invoke Script action, the browser event object should be passed into the script. This object should be named "evt", and accompany the other standard category and value series parameters.
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGInteractiveRenderer.java
{
	private Map labelPrimitives = new Hashtable( );
	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( );