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
return ct.getFullPath( );
		}
		return null;
	}
	private IContainer getDefaultContainer( Object selection )
	{
		IContainer ct = null;
		if ( selection instanceof IAdaptable )
		{
			IResource resource = (IResource) ( (IAdaptable) selection ).getAdapter( IResource.class );
			if ( resource instanceof IContainer && resource.isAccessible( ) )
			{
				ct = (IContainer) resource;
			}
			else if ( resource != null
					&& resource.getParent( ) != null
					&& resource.getParent( ).isAccessible( ) )
			{
				ct = resource.getParent( );
			}
		}
		return ct;
	}
	
	String getUniqueReportName( String prefix, String ext )
	{
		int counter = getCounter( prefix, ext );
		return counter == 0 ? prefix + ext 
				: prefix + "_" 
						+ counter + ext;