在Python/KivyMD中。带有复选框的MDDialog，如果选中其中一个复选框，“确认”按钮将不起作用

from kivymd.app import MDApp
from kivymd.uix.dialog import MDDialog
from kivymd.uix.button import MDFlatButton
from kivymd.uix.selectioncontrol import MDCheckbox

class MyApp(MDApp):
    def build(self):
        pass

def show_dialog(self):
    # 创建一个MDDialog对象
    dialog = MDDialog(
        title="选择操作",
        buttons=[
            MDFlatButton(text="确认", on_release=self.confirm_action),
            MDFlatButton(text="取消", on_release=self.cancel_action)
        ]
    )

    # 创建复选框对象
    checkbox = MDCheckbox(
        active=False,
        on_active=self.checkbox_callback
    )

    # 将复选框添加到对话框中
    dialog.add_widget(checkbox)

    # 显示对话框
    dialog.open()

def checkbox_callback(self, checkbox, value):
    if value:
        # 当复选框被选中时，禁用确认按钮
        for button in checkbox.parent.buttons:
            if button.text == "确认":
                button.disabled = True
    else:
        # 当复选框取消选中时，启用确认按钮
        for button in checkbox.parent.buttons:
            if button.text == "确认":
                button.disabled = False

def confirm_action(self, instance):
    # 在这里编写确认操作的代码
    pass

def cancel_action(self, instance):
    # 在这里编写取消操作的代码
    pass

def build(self):
    self.theme_cls.theme_style = "Light"
    self.theme_cls.primary_palette = "BlueGray"

    button = MDFlatButton(text="显示对话框", on_release=self.show_dialog)

    return button

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