code: def _scrollView( self, value ):
          
          if self._scrolling:
              return
          
          view_bar = self.uiGanttVIEW.verticalScrollBar()
          self._scrolling = True
          view_bar.setValue(value)
          self._scrolling = False
docs: Updates the gantt view scrolling to the inputed value.
          
          :param      value | <int>