Bug 180864 Change Allow Null option in Cascading Group.[0705]
Description: Change Allow Null option in Cascading Group. Build number:2.2.0.v20070404 Steps to reproduce: 1. New a cascading group and add sub parameter. Expected result: Is Required option in cascading group definition dialog. Actual result: Allow null value option in Cascading Group definition dialog Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
{
		try
		{
			saveParameterProperties( );
			inputParameterGroup.setName( UIUtil.convertToModelString( cascadingNameEditor.getText( ),
					true ) );
			inputParameterGroup.setPromptText( promptTextEditor.getText( ) );
			if ( isSingle( ) )
			{
				inputParameterGroup.setDataSetMode( DesignChoiceConstants.DATA_SET_MODE_SINGLE );
			}
			else
			{
				inputParameterGroup.setDataSetMode( DesignChoiceConstants.DATA_SET_MODE_MULTIPLE );
			}
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
			refreshParameterProperties( );
			return;
		}
		setResult( inputParameterGroup );
		super.okPressed( );
	}
	private void deleteRow( )
	{
		int index = valueTable.getTable( ).getSelectionIndex( );
		ScalarParameterHandle choice = (ScalarParameterHandle) ( (IStructuredSelection) valueTable.getSelection( ) ).getFirstElement( );
		if ( choice == null || choice == newParameter )