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.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ChartReportItemBuilderImpl.java
super( );
	}
	/**
	 * Open the chart with specified task
	 * 
	 * @param taskId
	 *            specified task to open
	 */
	public ChartReportItemBuilderImpl( String taskId )
	{
		super( );
		this.taskId = taskId;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.extensions.IReportItemBuilderUI#open(org.eclipse.birt.report.model.api.ExtendedItemHandle)
	 */
	public int open( final ExtendedItemHandle eih )
	{
		if ( iInstanceCount > 0 ) 
		{
			return Window.CANCEL;
		}
		iInstanceCount++;
		try
		{
			IReportItem item = null;
			try
			{