AIR Applications to gain system focus

Hi,

Sorry if this question was made before, but the search utility here is not as usable as I wish...

I made an AIR 1.1  application with Flash CS4 / ActionScript 3, that basically is a small chromeless application that runs basically in the background.

I want, under some circumstances, that this application could gain focus of the system, pulling it back to the forefront of the screen.

Is that possible with AS 3 ?

Thanks

Ignacio.