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
{
				designObject = src.getSource( );
			}
			else if ( getElementFromSource( src, StructureType.PLOT ) != null )
			{
				designObject = src.getSource( );
			}
			else if ( getElementFromSource( src, StructureType.CHART_BLOCK ) != null )
			{
				designObject = src.getSource( );
			}
			else if ( getElementFromSource( src, StructureType.AXIS ) != null )
			{
				designObject = src.getSource( );
			}
			if ( designObject != null )
			{
				String jsFunction = null;
				switch ( type )
				{
					case ActionType.TOGGLE_VISIBILITY :
						jsFunction = "toggleVisibility(evt"; 
						break;
					case ActionType.HIGHLIGHT :
						jsFunction = "highlight(evt";
						break;
				}
				if ( jsFunction == null )
				{
					assert false;