Bug 197269 Cant set a series invisible per default
I have a line chart with several value series. I want to have some invisible as the default, so I set the "OnLoad" event for the series to "Toggle Visbility". But the onLoad event is triggered for every segment of the series so the result, wether the line is visible or not, depends on a odd or even number of datapoints. The same happens with "Toggle Datapoint Visibility"
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGInteractiveRenderer.java
{
		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
	 * 
	 * @param pre
	 *            primitive render event
	 * @param drawText
	 *            TODO
	 */
	protected void groupPrimitive( PrimitiveRenderEvent pre, boolean drawText )
	{
		if ( _iun == null )
		{
			logger.log( ILogger.WARNING,
					Messages.getString( "exception.missing.component.interaction", getULocale( ) ) ); 
			return;
		}
		
		if ( pre.getSource( ) instanceof StructureSource )
		{
			StructureSource sourceObject = (StructureSource) pre.getSource( );
			Series seDT = (Series) getElementFromSource( sourceObject,