screen main_menu():
    ..........
    use navigation(0.45)

screen navigation(x=gui.navigation_xpos):
 
    vbox:
        style_prefix "navigation"
 
        xpos x

init python:
    def label_callback(name, abnormal):
        if name.startswith("_"): return
        store.current_label = name

    config.label_callback = label_callback

label start:

label newL:
    "[current_label]"

text "%s" % outputDay align If(a==1, (0.0, 1.0), (1.0, 0.0))

screen xxx():
    text.....