
1.  Font selection:  naming widget classes is not as helpful to the end
user as naming things visible in the window.  Maybe give examples?

2. You should make sure you call Fx:Init $s before building your
menubutton.  Fx:Init $s loads the resources and determines the fonts and
such.   Then build your menubuttons.   Finally call
        Fx_Menubar menubar ... -auxbuttons {list of buttons}
You really want to call -auxbuttons when defining Fx_Menubar.  Adding
buttons later doesn't do the right thing.   I'll see if there is
anything I can do about that.

