如何将MDDataTable添加到不是主应用程序类的类中的屏幕？

from kivymd.app import MDApp
from kivymd.uix.datatables import MDDataTable
from kivy.uix.screenmanager import Screen

class CustomScreen(Screen):
    def __init__(self, **kwargs):
        super(CustomScreen, self).__init__(**kwargs)

class CustomScreen(Screen):
    def __init__(self, **kwargs):
        super(CustomScreen, self).__init__(**kwargs)
        table_data = [
            ("Header 1", "Header 2", "Header 3"),
            ("Data 1-1", "Data 1-2", "Data 1-3"),
            ("Data 2-1", "Data 2-2", "Data 2-3")
        ]
        self.data_table = MDDataTable(
            size_hint=(0.9, 0.6),
            use_pagination=True,
            check=True,
            column_data=[("Column 1", dp(30)), ("Column 2", dp(30)), ("Column 3", dp(30))],
            row_data=table_data
        )
        self.add_widget(self.data_table)

class MyApp(MDApp):
    def build(self):
        screen_manager = ScreenManager()
        screen_manager.add_widget(CustomScreen(name='custom_screen'))
        return screen_manager

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