code: def setColumns(self, columns):
          
          super(XOrbTreeWidget, self).setColumns(columns)
          self.setFilteredColumns(range(len(columns)))
          self.assignOrderNames()
          self._columnsInitialized = True
docs: Sets the columns for this widget, and marks the system as having
          been initialized.
          
          :param      columns | [<str>, ..]