ShowcaseScreen:
    popup: popup.__self__
    fullscreen: True
    name: 'Popups'
    BoxLayout:
        id: bl
        Popup:
            id: popup
            title: "Hello World"
            on_parent:
                if self.parent == bl: self.parent.remove_widget(self)
            Button:
                text: 'press to dismiss'
                on_release: popup.dismiss()
        Button:
            text: 'press to show Popup'
            on_release: root.popup.open()