def add_child(self, key, child):
        if hasattr(child, 'attributes'):
            child.attributes['parent_widget'] = str(id(self))

        if key in self.children:
            self._render_children_list.remove(self.children[key])
        self._render_children_list.append(child)

        self.children[key] = child
Adds a child to the Tag
dataset/ETHPy150Open dddomodossola/remi/remi/gui.py/Tag.add_child