[plt-scheme] Setting the text selection color in DrScheme on OS X?

Hi,

I am totally new to OS X, and running DrScheme on it.

The text selection color seems to be a light blue in all apps, and
when I select something with the "White on Black" syntax highlighting
scheme selected, you can't see anything selected but for the white
text. When I switch to "Black on White" it works fine.

Is this is a limitation of using OS X or can I change this in DrScheme
so that I can see the selection?

Best wishes,

Grant