Bug 198031 Legend interactivity does not work correctly for drill-throughs
Under Value (Y) Series enable interactivity for the event "Mouse Click" Set action to Hyperlink The type of the hyperlink is Drill-through and the target is the a sub-report Pass parameter to sub-report as row["value_of_the_legend_item"] Suppose there are 3 values, x,y and z No matter which legend item you click (x, y or z), z gets passed as param to the subreport
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/TriggerDataComposite.java
if ( trigger == null )
		{
			initUI( );
			return;
		}
		
		switch ( getTriggerIndex( ) )
		{
			case INDEX_1_URL_REDIRECT :
				this.slValues.topControl = cmpURL;
				URLValue urlValue = (URLValue) trigger.getAction( ).getValue( );
				sBaseURL = urlValue.getBaseUrl( );
				
				
				
				txtBaseParm.setText( ( urlValue.getBaseParameterName( )
						.length( ) > 0 ) ? urlValue.getBaseParameterName( )
						: "" ); 
				txtValueParm.setText( ( urlValue.getValueParameterName( )
						.length( ) > 0 ) ? urlValue.getValueParameterName( )
						: "" ); 
				txtSeriesParm.setText( ( urlValue.getSeriesParameterName( )
						.length( ) > 0 ) ? urlValue.getSeriesParameterName( )
						: "" ); 
				break;
			case INDEX_2_TOOLTIP :
				this.slValues.topControl = cmpTooltip;
				TooltipValue tooltipValue = (TooltipValue) trigger.getAction( )
						.getValue( );