Bug 120503 Cascading Parameter can not drop into layout
Details: Cascading Parameter can not drop into layout Step: 1.Open a report design and Create a Sample Data Source and data set by "select * from CLASSICMODELS.CUSTOMERS" 2.New a cascading parameter and create CUSTOMERSNUMBER and CUSTOMERSNAME in parameter named number and name. Press OK 3.Drop parameter name into layout. Actual results: The parameter in Cascading Parameter Group can not drop to layout
UI/org.eclipse.birt.report.designer.ui.ide/src/org/eclipse/birt/report/designer/ui/ide/wizards/NewReportWizard.java
private static final List tmpList = new ArrayList( );
    private IConfigurationElement configElement;
	boolean validDuplicate( String prefix, String ext, int count,
			IResource res )
	{
		if ( res != null && res.isAccessible( ) )
		{
			final String name;
			if ( count == 0 )
			{
				name = prefix + ext;
			}
			else
			{
				name = prefix + "_" + count + ext; 
			}
			try
			{
				tmpList.clear( );
				res.accept( new IResourceVisitor( ) {
					public boolean visit( IResource resource )
							throws CoreException
					{
						if ( resource.getType( ) == IResource.FILE
								&& name.equals( ( (IFile) resource ).getName( ) ) )
						{
							tmpList.add( Boolean.TRUE );
						}
						return true;
					}