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
ExceptionHandler.handle( e );
				}
			}
			if ( actualElement == newParameter )
			{
				if ( ( isSingle( ) || ( newParameter.getDataSetName( ) != null && newParameter.getDataSetName( )
						.length( ) > 0 ) )
						&& ( !COLUMN_NAME.equals( property ) ) )
				{
					try
					{
						inputParameterGroup.getParameters( ).add( newParameter );
					}
					catch ( SemanticException e )
					{
						ExceptionHandler.handle( e );
						return;
					}
					clearNewParameter( );
				}
			}
			refreshValueTable( );
			refreshParameterProperties( );
			updateButtons( );
		}
	};
	private void clearNewParameter( )
	{
		newParameter = null;
		givenName = false;