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
}
			if ( newParameter == null )
			{
				newParameter = DesignElementFactory.getInstance( )
						.newScalarParameter( null ); 
				givenName = false;
				try
				{
					newParameter.setControlType( DesignChoiceConstants.PARAM_CONTROL_LIST_BOX );
					newParameter.setValueType( DesignChoiceConstants.PARAM_VALUE_TYPE_DYNAMIC );
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			elementsList.add( newParameter );
			return elementsList.toArray( );
		}
		public void dispose( )
		{
		}
		public void inputChanged( Viewer viewer, Object oldInput,
				Object newInput )
		{
		}
	};
	private ITableLabelProvider labelProvider = new ITableLabelProvider( ) {
		public Image getColumnImage( Object element, int columnIndex )
		{