How to change iconbox title in MWM?

I am using the Motif Window Manager as my desktop. Motif allows many settings to be adjusted in ~/.Xdefaults. I have a lot of settings, which are confirmed to work here, such as changing the color. One setting which I strangely cannot get to work is changing the iconbox's window title. Adding Mwm*useIconBox: True to ~/.Xdefaults allows the iconbox to appear, but it displays the default title "iconbox". According to the manual, there are two settings, Mwm*iconBoxTitle and Mwm*iconBoxName, one of which I believe should allow the title to be changed, but I cannot get either to work. Preferably, I'd like the iconbox to display the day's date as its title, so that real estate on screen has some use. How can I get the Mwm*iconBoxTitle option to work? I've tried many different combinations of commands in the ~.Xdefaults file, such as: Mwm*iconBoxTitle: my title Mwm*iconBoxTitle(my title) Mwm*iconBoxTitle: "my title" I've found sample screenshots of different OSes running MWM confirming that the iconbox window title can be changed. I've also found a few sample ~/.Xdefaults files using these Mwm*iconBoxTitle commands, yet copying this code to my own ~.Xdefaults did not result in any title changes. How can I change the window title of the Motif Window Manager's iconbox?