I'm trying to disable the popup menu on an xterm running MWM that
comes up when you right mouse-click in the title bar. I've created my
own xterm client and added its reference in the file

I am able to turn off the menu button in the title bar using the

Mwm*myXterm.clientDecoration: -menu

But when I try to take it one step further and disable the right-click
menu using:

Mwm*myXterm*windowMenu: none
Mmw*myXterm*wMenuButtonClick: False

It never seems to make any difference. I'm guessing these settings
only apply to the menuButton. Anyone have a creative way to
accomplish this?