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.samplesview/src/org/eclipse/birt/report/designer/ui/samplesview/sampleslocator/SampleIncludedSourceEntry.java
return null;
	}
	public static Enumeration getIncludedLibraries( )
	{
		return samplesBundle.findEntries( librariesFragmentPath,
				"*.rptlibrary",
				false );
	}
	public static Enumeration getJavaObjects( )
	{
		return samplesBundle.findEntries( scriptedDataSourceFragmentPath,
				"*.java",
				false );
	}
	public static Enumeration getExtendedPlugin( String categoryName )
	{
		
		return samplesBundle.findEntries( extendingFragmentPath
				+ "/"
				+ categoryName, "*.zip", false );
	}
	
	public static Enumeration getIncludedPng()
	{
		return samplesBundle.findEntries( pngFragmentPath,
				"*.png",
				false );
	}
}