docs: def ganttWidget(self):
          """
          Returns the gantt widget that this item is linked to.
          
          :return     <XGanttWidget> || None
          """
          tree = self.treeWidget()
          if ( not tree ):
              return None
          
          from projexui.widgets.xganttwidget import XGanttWidget
          return projexui.ancestor(tree, XGanttWidget)