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/TreeViewPalettePage.java
}
	private SourceViewer getViewer( )
	{
		IEditorPart activeEditor = PlatformUI.getWorkbench( )
				.getActiveWorkbenchWindow( )
				.getActivePage( )
				.getActiveEditor( );
		IFormPage page = null;
		if ( activeEditor instanceof MultiPageReportEditor )
		{
			page = ( (MultiPageReportEditor) activeEditor ).getCurrentPageInstance( );
		}
		else if ( activeEditor instanceof IReportEditor )
		{
			IEditorPart editor = ( (IReportEditor) activeEditor ).getEditorPart( );
			if ( editor instanceof MultiPageReportEditor )
			{
				page = ( (MultiPageReportEditor) editor ).getCurrentPageInstance( );					
			}
		}
		if ( page instanceof ReportScriptFormPage )
		{
			if ( ( (ReportScriptFormPage) page ).getScriptEditor( ) instanceof JSEditor )
			{
				return ( (JSEditor) ( (ReportScriptFormPage) page ).getScriptEditor( ) ).getViewer( );
			}
		}
		return null;
	}
}