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.lib/src/org/eclipse/birt/report/designer/internal/lib/views/outline/LibraryOutlinePage.java
{
	/**
	 * @param reportHandle
	 */
	public LibraryOutlinePage( ModuleHandle reportHandle )
	{
		super( reportHandle );
	}
	protected void addDragAndDropListener()
	{
		
		int ops = DND.DROP_MOVE | DND.DROP_COPY;
		Transfer[] transfers = new Transfer[]{
			TemplateTransfer.getInstance( )
		};
		getTreeViewer( ).addDragSupport( ops,
				transfers,
				new DesignerDragListener( getTreeViewer( ) ) );
		transfers = new Transfer[]{
			TemplateTransfer.getInstance( )
		};
		
		DesignerDropListener dropListener = new LibraryDropListener( getTreeViewer( ) );
		dropListener.addDropConstraint( ParameterGroupHandle.class,