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
String groupIdentifier = null;
			
			
			if ( isColoredByCategories( ) )
			{
				seDT = findCategorySeries( seRT );
				final int baseIndex = getDataPointHints( src ).getIndex( );
				StringBuffer sb = new StringBuffer( );
				sb.append( "'" );
				sb.append( seDT.hashCode( ) );
				sb.append( "index" ); 
				sb.append( baseIndex );
				sb.append( "'" );
				groupIdentifier = sb.toString( );
			}
			else
			{
				try
				{
					seDT = findDesignTimeSeries( seRT );
				}
				catch ( ChartException e )
				{
					logger.log( e );
					return null;
				}
				groupIdentifier = String.valueOf( seDT.hashCode( ) );
			}
			
			boolean includeLabels = true;