Bug 312531 Highlight works differently when run SvgInteractivityViewer.java [13]
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGInteractiveRenderer.java
*            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,
					StructureType.SERIES );
			if ( seDT != null )
			{
				String groupIdentifier = null;
				try
				{
					
					if ( isColoredByCategories( )
							&& getElementFromSource( sourceObject,
									StructureType.SERIES_DATA_POINT ) != null )
					{
						seDT = findCategorySeries( seDT );
						groupIdentifier = String.valueOf( seDT.hashCode( ) );