docs: def _scrollTree( self, value ):
          """
          Updates the tree view scrolling to the inputed value.
          
          :param      value | <int>
          """
          if self._scrolling:
              return
          
          tree_bar = self.uiGanttTREE.verticalScrollBar()
          self._scrolling = True
          tree_bar.setValue(value)
          self._scrolling = False