Howto recreate the blurred background of modal windows

Hi all,

Any ideas on how I can create a window modal effect (android)? What I am looking for is the blurred background that you get when you open a window in Modal mode.

I know setting opacity 0.6 and backgroundColor "#000" sort of does it, but then you really get a see-through effect. Which is not quite the same as the blurred effect.

Thanks,

Gino