Kivy: TextInput focus selection

focustext.py

import kivy
kivy.require('1.8.1')

from kivy.app import App
from kivy.lang import Builder
from kivy.clock import Clock

root = Builder.load_string('''
#:import Clock kivy.clock.Clock
FloatLayout:
    TextInput:
        id: ti
        size_hint: None, None
        size: 100, 100
        pos: 100, 100
        text: 'asdgasg'
        on_focused: self.focused and Clock.schedule_once(lambda dt: self.select_all())
''')

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

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