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
* 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IUIServiceProvider#getRegisteredKeys()
	 */
	public final List getRegisteredKeys( )
	{
		return extendedHandle.getModuleHandle( ).getMessageKeys( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IUIServiceProvider#getValue(java.lang.String)
	 */
	public final String getValue( String sKey )
	{
		String value = extendedHandle.getModuleHandle( ).getMessage( sKey );
		if ( value == null || value.equals( "" ) ) 
		{
			return sKey;
		}
		return value;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IUIServiceProvider#getConvertedValue(double,
	 *      java.lang.String, java.lang.String)
	 */
	public final double getConvertedValue( double dOriginalValue,
			String sFromUnits, String sToUnits )
	{