btn_lyt.py

from kivy.factory import Factory as F
from kivy.app import App
from kivy.lang import Builder


KV = '''
<ButtonLayout>:
    on_press: print("here or there")

    Label:
        text: 'here'
    Label:
        text: 'there'

FloatLayout:
    ButtonLayout:
        size_hint: None, None
        size: 200, 200
        pos_hint: {'center': (.5, .5)}
'''


class ButtonLayout(F.ButtonBehavior, F.BoxLayout):
    pass


class TestApp(App):
    def build(self):
        return Builder.load_string(KV)


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