thank you for the answer. i didn't checked it so i waste a lot of time to find all that by myself.

I used nameOwnerChanged signal to know when an app starts or stops.
The problem is that hildon-desktop pre starts some apps and effectively call the top_application method to popup the app

I think i can catch method_calls with low level dbus lib
but im using glib bindings is it possible match whatever we want with glib binding?

An other solution is to disable (temporarily...) prestarting...