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
{
			GridData gd = new GridData( GridData.FILL_BOTH );
			gd.verticalSpan = 2;
			txtScript.setLayoutData( gd );
			txtScript.setToolTipText( Messages.getString( "TriggerDataComposite.Tooltip.InputScript" ) ); 
		}
		btnScriptExpBuilder = new Button( cmpScript, SWT.PUSH );
		{
			GridData gd = new GridData( );
			gd.heightHint = 20;
			gd.widthHint = 20;
			gd.verticalAlignment = GridData.BEGINNING;
			gd.horizontalAlignment = GridData.END;
			btnScriptExpBuilder.setLayoutData( gd );
			btnScriptExpBuilder.setImage( UIHelper.getImage( "icons/obj16/expressionbuilder.gif" ) ); 
			btnScriptExpBuilder.addSelectionListener( this );
			btnScriptExpBuilder.setToolTipText( Messages.getString( "DataDefinitionComposite.Tooltip.InvokeExpressionBuilder" ) ); 
			btnScriptExpBuilder.getImage( )
					.setBackground( btnScriptExpBuilder.getBackground( ) );
		}