Keyboard Shortcut to Close / Minimize Main WWL Window

It would be very helpful if there was a keyboard method to close / minimize the WWL main window. Currently, it appears that the only way to minimize the application is the click on the down arrow button to the right of Options. I use several other apps that run in the toolbar. They use one or more of the following keyboard actions to minimize the main window to the tray:

Alt-F4 - Normally closes the app but typically minimizes to tray for tray oriented apps

Esc key

Thanks for listening.