Negate session filter in gui

Hi All, 

I know how I can negate a session filter from CLI, but haven't found a way to do it in the gui. I don't like much the search box in gui isn't very intuitive/easy to use, but at least it does offer a nicer view of sessions ;)

So anyone know how we could negate a session filter in GUI, as an example, I would like to list all session that aren't port 53 or all session aren't using the "HighPrio" Traffic Shaper..

Thanx for you help!