code: def on_lstLayerModes_itemSelectionChanged(self):
          
          self.clear_further_steps()
          # Set widgets
          layer_mode = self.selected_layermode()
          # Exit if no selection
          if not layer_mode:
              self.lblDescribeLayerMode.setText('')
              return
          # Set description label
          self.lblDescribeLayerMode.setText(layer_mode['description'])
          # Enable the next button
          self.parent.pbnNext.setEnabled(True)
docs: Update layer mode description label and unit widgets.
  
          .. note:: This is an automatic Qt slot
             executed when the subcategory selection changes.