There is a keyboard shortcut for moving between windows of an application with a pop up window (default ALT + ~ ),but you can only move to different windows using the arrow buttons. Pressing the ~ button only shows the pop up with the cursor on the second window making a loop with the 1st and 2nd window if you don't use the arrows. Shouldn't it work like the ALT + Tab combo, which you move between applications with both the Tab and arrow buttons?
With Caja it shows the desktop as an option, but doesn't do anything if you choose it.
Also noticed it doesn't work with certain programs like chromium. Only shows one window instead of all of them.