availableGeometry() & Gnome

I'm having a little problem running a program I wrote on Gnome.

I have a little pop-up window that is supposed to appear at the bottom right corner of the screen. I use QApplication::desktop()->availableGeometry().height() to find the location for the popup.

In KDE it works fine, but in Gnome the Pop-up is a fair bit above the taskbar, anyone know how to get around that?

Thanks in advance.