Bug 154832 Wrong node is added to Report Parameters for cascading parameter in Palette view
Description: Wrong node is added to Report Parameters for cascading parameter in Palette view. Steps to reproduce: 1. New a report, add a cascading parameter 2. Switch to Script tab in Editor view, and then switch to Palette view 3. Expand Report Parameters node Expected result: A cascading parameter group is added to Report Parameters node Actual result: Expect a cascading parameter group is added to Report Parameters node, the children of the cascading parameter group are added as scalar parameters
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/internal/ui/editors/script/JSEditor.java
JSExpListProvider provider = new JSExpListProvider( );
		cmbExprListViewer.setContentProvider( provider );
		cmbExprListViewer.setLabelProvider( provider );
		
		Object model = getModel( );
		if ( model != null )
		{
			cmbExpList.setVisible( true );
			setComboViewerInput( model );
		}
		else
		{
			setComboViewerInput( Messages.getString( "JSEditor.Input.trial" ) ); 
		}
		cmbExprListViewer.addSelectionChangedListener( palettePage.getSupport( ) );
		cmbExprListViewer.addSelectionChangedListener( new ISelectionChangedListener( ) {
			/**
			 * selectionChanged( event) - This listener implementation is
			 * invoked when an item in the combo box is selected, - It saves the
			 * current editor contents. - Updates the editor content with the
			 * expression corresponding to the selected method name or
			 * expression. name.
			 */
			public void selectionChanged( SelectionChangedEvent event )
			{
				ISelection selection = event.getSelection( );
				if ( selection != null )
				{
					settingText = true;
					Object[] sel = ( (IStructuredSelection) selection ).toArray( );