How to (or is it possible to) show the dash outside overview mode?

[Nguyen Thai Ngoc Duy <pclouds gmail com>]

Hi,

I want to experiment with Super-Tab as a way to switch application,
but instead of showing app switcher at the center, I show the dash and
use it as app switcher.

I can catch "Super-key pressed" event by modifying mutter, but I
cannot make the dash show without overview layout (showing some more
is OK, I don't care now). I tried Main.overview._group.show(). It only
worked once and then stopped working until gnome-shell was restarted.
Any hints how to do that?
-- 
Duy