Settings window missing from Command-Tab switcher

[ryanwaite]

Steps to reproduce

1. Open the ZoomIt Settings dialog
2. Command-Tab to a different window
3. Attempt to Command-Tab back to the ZoomIt window

Result

You can't return via Command-Tab — ZoomIt does not appear in the Command-Tab application/window list.

Expected

The ZoomIt Settings window should be reachable through the Command-Tab switcher.