docs: def insertTopLevelItem( self, index, item ):
          """
          Inserts the inputed item at the given index in the tree.
          
          :param      index   | <int>
                      item    | <XGanttWidgetItem>
          """
          self.treeWidget().insertTopLevelItem(index, item)
          
          if self.updatesEnabled():
              try:
                  item.sync(recursive = True)
              except AttributeError:
                  pass