Where to specify fonts for which apps?

[Kent West <westk@acu.edu>]

Whenever I've got xfstt running, several apps have
menus, etc that use cursive, hard-to-read fonts.
For example, when I ctrl-right-click on an xterm
to bring up the fontsize menu, all the text in
that pop-up menu is hard-to-read cursive. Where do
I specify what fonts will be used in this pop-up
menu?

Thanks!