Event interface received when handling a 'uxpcommand' event.
https://developer.adobe.com/photoshop/uxp/2022/guides/how-to/#how-to-get-notified-that-your-panel-is-opening-or-closing
Event interface received when handling a 'uxpcommand' event.
See
https://developer.adobe.com/photoshop/uxp/2022/guides/how-to/#how-to-get-notified-that-your-panel-is-opening-or-closing