如何在kivy中回调FloatingActionButtonSpeedDial中每个按钮的多个函数？

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.button import Button
from kivymd.uix.button import MDFloatingActionButtonSpeedDial


class MyButtonCallbacks:
    def callback1(self, instance):
        print("Button 1 callback")

    def callback2(self, instance):
        print("Button 2 callback")

    def callback3(self, instance):
        print("Button 3 callback")


class MyApp(App):
    def build(self):
        layout = FloatLayout()

        callbacks = MyButtonCallbacks()

        button1 = Button(text="Button 1")
        button1.bind(on_release=callbacks.callback1)

        button2 = Button(text="Button 2")
        button2.bind(on_release=callbacks.callback2)

        button3 = Button(text="Button 3")
        button3.bind(on_release=callbacks.callback3)

        fab_speed_dial = MDFloatingActionButtonSpeedDial()
        fab_speed_dial.add_widget(button1)
        fab_speed_dial.add_widget(button2)
        fab_speed_dial.add_widget(button3)

        layout.add_widget(fab_speed_dial)

        return layout


if __name__ == '__main__':
    MyApp().run()