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
hotspotLayer.setAttribute( "style", "fill-opacity:0.01;fill:#FFFFFF;" );  
	}
	private ULocale getULocale( )
	{
		return locale;
	}
	private boolean isColoredByCategories( )
	{
		return this._iun.getRunTimeModel( ).getLegend( ).getItemType( ) == LegendItemType.CATEGORIES_LITERAL;
	}
	private String findFirstComponentId(WrappedStructureSource src){
		final Series seRT = (Series) getElementFromSource( src.getParent(),
				StructureType.SERIES );
		if ( seRT != null )
		{
			Series seDT = null;
			String groupIdentifier = null;
			
			
			if ( isColoredByCategories( ) )
			{
				seDT = findCategorySeries( seRT );
				StringBuffer sb = new StringBuffer( );
				sb.append( seDT.hashCode( ) );
				sb.append( "index" ); 
				
				
				sb.append( iFirstDataPointIndex );
				groupIdentifier = sb.toString( );
			}