code: def _closeResources(self):
          
          verCrossViewBox = self.pgImagePlot2d.verCrossPlotItem.getViewBox()
          verCrossViewBox.sigRangeChangedManually.disconnect(self.yAxisRangeCti.setAutoRangeOff)
          horCrossViewBox = self.pgImagePlot2d.horCrossPlotItem.getViewBox()
          horCrossViewBox.sigRangeChangedManually.disconnect(self.xAxisRangeCti.setAutoRangeOff)
  
          self.pgImagePlot2d.verCrossPlotItem.sigAxisReset.disconnect(self.setVerCrossPlotAutoRangeOn)
          self.pgImagePlot2d.horCrossPlotItem.sigAxisReset.disconnect(self.setHorCrossPlotAutoRangeOn)
          self.pgImagePlot2d.imagePlotItem.sigAxisReset.disconnect(self.setImagePlotAutoRangeOn)
docs: Disconnects signals.
              Is called by self.finalize when the cti is deleted.