docs: def takeTopLevelItem( self, index ):
          """
          Removes the top level item at the inputed index from the widget.
          
          :param      index | <int>
          
          :return     <XGanttWidgetItem> || None
          """
          item = self.topLevelItem(index)
          if item:
              self.viewWidget().scene().removeItem(item.viewItem())
              self.treeWidget().takeTopLevelItem(index)
              
              return item
          return None