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
if ( editorUIEnabled == true )
		{
			
			saveModel( );
		}
		if ( selection != null )
		{
			settingText = true;
			Object[] sel = ( (IStructuredSelection) selection ).toArray( );
			if ( sel.length == 1 && sel[0] instanceof DesignElementHandle )
			{
				
				editObject = sel[0];
				palettePage.getSupport( ).setCurrentEditObject( editObject );
				if ( editObject instanceof ExtendedItemHandle )
				{
					disableEditor( );
					cmbExpList.removeAll( );
					cmbItemLastSelected = null;
					getSourceViewer( ).getTextWidget( ).setEnabled( true );
					setEditorText( ( (ExtendedItemHandle) editObject ).getExternalScript( ) );
					context.setVariable( "this", "org.eclipse.birt.report.model.api.ExtendedItemHandle" ); 
				}
				else
				{
					setComboViewerInput( editObject );
					
					cmbItemLastSelected = null;
					setEditorText( "" );