docs: def addAction(self, action):
          """
          Adds the inputed action to this toolbar.
          
          :param      action | <QAction>
          """
          super(XDockToolbar, self).addAction(action)
          
          label = XDockActionLabel(action, self.minimumPixmapSize(), self)
          label.setPosition(self.position())
          
          layout = self.layout()
          layout.insertWidget(layout.count() - 1, label)