[plt-scheme] changing the standard font in a list box

Hello
I'm learning Scheme at the Uni and I've got a little problem with the display 
of my choices in a listBox.
I'd like either change the default font of the string in my list box, either 
insert tabulations within the strings
The problem with tabulations is that the result is only visible when 
displaying the string on an output, not when choices are visible.
I can change the font of a string or a string-snip, creating a font% object 
but i don't know of to do with strings in a list box ...
If somebody can help me ... ?

thx
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