[plt-scheme] Changing style of DrScheme definition editor

[Wiwat Ruengmee]

hi,

i am implementing a drscheme tool. this tool needs to change background 
of text in the (drscheme) editor. i tried to use style-delta% and 
change-style. but seem like drcheme does not let me change text style. 
any info or pointers to this issue will be great.

thank you.