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
return 0;
	}
	private Label addDescriptionLabel( Composite parent, int horizontalSpan,
			String description )
	{
		Label label = new Label( parent, SWT.WRAP );
		{
			GridData gd = new GridData( );
			gd.widthHint = 200;
			gd.horizontalSpan = horizontalSpan;
			label.setLayoutData( gd );
			label.setText( description );
		}
		return label;
	}
	/**
	 * Marks UI will save the trigger when closing
	 * 
	 */
	public void markSaveWhenClosing( )
	{
		this.needSaveWhenDisposing = true;
	}
	public void setTrigger( Trigger trigger )
	{
		if ( trigger == null )
		{
			clear( );
			return;
		}