Kivy: small ModalView

modaltest.py

import kivy
kivy.require('1.8.1')

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

root = Builder.load_string('''
<MyModalView@ModalView>:
    size_hint: 0.5, 0.5
    Button:
        text: 'close'
        on_release: root.dismiss()

Button:
    text: 'open'
    on_release: app.open_modal()
''')

class TestApp(App):
    def build(self):
        return root

    def open_modal(self):
        Factory.MyModalView().open()

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