如何创建弹出GridLayout或任何其他默认窗口小部件的自定义Kivymd MDDialog

from kivymd.app import MDApp
from kivymd.uix.dialog import MDDialog
from kivy.uix.gridlayout import GridLayout

class CustomGridLayout(GridLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        # 在这里添加自定义的布局和内容

class CustomMDDialog(MDDialog):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.content_cls = CustomGridLayout()

class MyApp(MDApp):
    def show_custom_dialog(self):
        dialog = CustomMDDialog()
        dialog.open()

from kivymd.uix.button import MDFlatButton

class MyApp(MDApp):
    def build(self):
        button = MDFlatButton(text="Open Custom Dialog", on_release=self.show_custom_dialog)
        # 添加其他布局和内容