code: def on_pbnBack_released(self):
          
          current_step = self.get_current_step()
          if current_step.step_type == STEP_FC:
              new_step = self.impact_function_steps.pop()
          elif current_step.step_type == STEP_KW:
              try:
                  new_step = self.keyword_steps.pop()
              except IndexError:
                  new_step = self.impact_function_steps.pop()
          else:
              raise InvalidWizardStep
  
          # set focus to table widgets, as the inactive selection style is gray
          if new_step == self.step_fc_functions1:
              self.step_fc_functions1.tblFunctions1.setFocus()
          if new_step == self.step_fc_functions2:
              self.step_fc_functions2.tblFunctions2.setFocus()
          # Re-connect disconnected signals when coming back to the Extent step
          if new_step == self.step_fc_extent:
              self.step_fc_extent.set_widgets()
          # Set Next button label
          self.pbnNext.setText(tr('Next'))
          self.pbnNext.setEnabled(True)
          self.go_to_step(new_step)
docs: Handle the Back button release.
  
          .. note:: This is an automatic Qt slot
             executed when the Back button is released.