test-kivy-app/kivy_venv/share/kivy-examples/demo/showcase/data/screens/togglebutton.kv

ShowcaseScreen:
    name: 'ToggleButton'

    GridLayout:

        cols: 3
        spacing: '8dp'
        size_hint_y: None
        height: self.minimum_height

        Label:
            text: 'Choice 1'

        ToggleButton:
            size_hint_y: None
            height: '48dp'
            text: 'A'
            group: 'g1'

        ToggleButton:
            size_hint_y: None
            height: '48dp'
            text: 'B'
            group: 'g1'

        Label:
            text: 'Choice 2'

        ToggleButton:
            size_hint_y: None
            height: '48dp'
            text: 'A'
            group: 'g2'

        ToggleButton:
            size_hint_y: None
            height: '48dp'
            text: 'B'
            group: 'g2'