code: def _createComboBoxes(self, row):
          
          tree = self.tree
          model = self.tree.model()
          self._setColumnCountForContents()
  
          for col, _ in enumerate(self._axisNames, self.COL_FIRST_COMBO):
              logger.debug("Adding combobox at ({}, {})".format(row, col))
              comboBox = QtWidgets.QComboBox()
              comboBox.setSizeAdjustPolicy(QtWidgets.QComboBox.AdjustToContents)
              comboBox.activated.connect(self._comboBoxActivated)
              self._comboBoxes.append(comboBox)
  
              #editor = LabeledWidget(QtWidgets.QLabel(comboLabel), comboBox)
              tree.setIndexWidget(model.index(row, col), comboBox)
docs: Creates a combo box for each of the fullAxisNames