code: def setColumnType( self, columnType ):
          
          if ( columnType == self._columnType ):
              return False
          
          self._columnType = columnType
          self.rebuild()
          return True
docs: Sets the column type for this widget to the inputed type value.
          This will reset the widget to use one of the plugins for editing the
          value of the column.
          
          :param      columnType | <orb.ColumnType>