code: def child_added(self, child):
          
          super(UiKitView, self).child_added(child)
  
          layout = self.layout
          for i, child_widget in enumerate(self.child_widgets()):
              if child_widget == child.widget:
                  layout.insertArrangedSubview(child_widget, atIndex=i)
                  layout.insertSubview(child_widget, atIndex=i)
docs: Handle the child added event from the declaration.
  
          This handler will unparent the child toolkit widget. Subclasses
          which need more control should reimplement this method.