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
DataPointHints dph = (DataPointHints) getElementFromSource( sourceObject,
								StructureType.SERIES_DATA_POINT );
						groupIdentifier += "index"; 
						groupIdentifier += dph.getIndex( );
						
						if ( iFirstDataPointIndex < 0 )
						{
							
							iFirstDataPointIndex = dph.getIndex( );
						}
					}
					else
					{
						seDT = findDesignTimeSeries( seDT );
						groupIdentifier = String.valueOf( seDT.hashCode( ) );
					}
				}
				catch ( ChartException e )
				{
					logger.log( e );
					return;
				}
				
				if ( drawText )
				{
					String id = Integer.toString( pre.hashCode( ) );
					List<String> components = labelPrimitives.get( seDT );
					if ( components == null )
					{