def __init__(self, screen):
Frame.__init__(self, screen, (300, 110), (20, 20))
self.l1 = Label(self, "Velocidad inicial", position=(30, 10))
self.t1 = TextBox(self, (160, 10))
self.l2 = Label(self, "Ángulo", position=(30, 40))
self.t2 = TextBox(self, (160, 40))
self.textboxes = {'angle': self.t2, 'v_0': self.t1}
