docs: def showConfig( self ):
          """
          Show the config widget for the currently selected plugin.
          """
          item = self.uiPluginTREE.currentItem()
          if not isinstance(item, PluginItem):
              return
          
          plugin = item.plugin()
          widget = self.findChild(QWidget, plugin.uniqueName())
          
          if ( not widget ):
              widget = plugin.createWidget(self)
              widget.setObjectName(plugin.uniqueName())
              self.uiConfigSTACK.addWidget(widget)
              
          self.uiConfigSTACK.setCurrentWidget(widget)