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
}
					else
					{
						( (ScalarParameterHandle) actualElement ).setDataSetName( (String) value );
					}
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			else if ( COLUMN_VALUE.equals( property ) )
			{
				try
				{
					( (ScalarParameterHandle) actualElement ).setValueExpr( DEUtil.getColumnExpression( (String) value ) );
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			else if ( COLUMN_DISPLAY_TEXT.equals( property ) )
			{
				try
				{
					( (ScalarParameterHandle) actualElement ).setLabelExpr( DEUtil.getColumnExpression( (String) value ) );
				}
				catch ( SemanticException e )
				{