How to access the Menu Mnemonics of an X11 Program within macOS With the kind assistance of X11 Quartz background app I have an X11 app Dia diagramming tool running.



It is enticing to see those mnemonics apparently (?) available to use. I have a serious beef with macOS for not helping those of us who are keyboardists to have an option to work in that manner. 

So, is it possible to access those mnemonics? I have tried various combinations of Option, Control, Control + Option, with/without Command plus the given letter.
I just noticed a related question on this site:  

How can I get the Alt key to work in an X11 application?


It will take some time to try this out .. will report back in couple of days.