Bug 189590 Error occurs when click drill-through link in sample report "OrderMasterAfter.rptdesign"
Description: Open "Report Example" view, open "Drill to Details" directory. Open "OrderMasterAfter.rptdesign" file. Preview in layout, and then click the first column "ORDERNUMBER" value, which defines drill-through link in it. Exception throws out when click on it. Build version:2.2.0.v20070529-0630. Expected result: Even if the "OrderDetailAfter.rptdesign" isn't opened, the drill-through link in the master report should drill to the detailed report.
UI/org.eclipse.birt.report.designer.ui.samples.rcp/src/org/eclipse/birt/report/designer/ui/samples/rcp/action/RCPOpenSampleReportAction.java
IOpenSampleReportAction
{
	private static final String ACTION_TEXT = Messages.getString( "SampleReportsView.Action.openSampleReport" );
	private ReportExamples composite;
	public RCPOpenSampleReportAction( )
	{
		super( ACTION_TEXT );
		setToolTipText( Messages.getString( "SampleReportsView.Action.openSampleReport.toolTipText.rcp" ) );
	}
	public void setMainComposite( ReportExamples composite )
	{
		this.composite = composite;
	}
	public void run( )
	{
		TreeItem item = (TreeItem) composite.getSelectedElement( );
		Object selectedElement = item.getData( );
		if ( selectedElement == null
				|| !( selectedElement instanceof ReportDesignHandle ) )
		{
			return;
		}