Menu shortcut while popup visible

On mouseup on a canvas, I construct a menu
It clones my normal Copy and Cut items in the Edit menu
They have keyboard shortcuts of C and X as you would expect.

I popup the constructed menu.
It contains Copy and Cut , as well as the Edit menu.

While the menu is poppedup, CMD-C works to do a copy on MAC
But on Windows, I just get a ‘ping’ and no copy occurs.

Is a popped up menu a keyboard shortcut blocker under Windows?
How might I get CTRL-C to act as Copy under these conditions?