if ( value == null ) { value = LABEL_NULL; }
	private boolean containValue( SelectionChoice selectedChoice,			String newValue, String property )	{		for ( Iterator iter = choiceList.iterator( ); iter.hasNext( ); )		{			SelectionChoice choice = (SelectionChoice) iter.next( );			if ( choice != selectedChoice )			{				String value = null;				// if ( COLUMN_VALUE.equals( property ) )				// {				// value = choice.getValue( );				// if ( isEqual( value, newValue ) )				// {				// return true;				// }				// }				if ( COLUMN_DISPLAY_TEXT.equals( property ) )				{					value = choice.getLabel( );					if ( value == null )					{						value = choice.getValue( );					}					if ( value == null )					{						value = LABEL_NULL;					}					if ( value.equals( newValue ) )					{						return true;					}				}			}		}		return false;	}