gEDA-user: Ground plane question

[Donato Azevedo]

Guys, I have a little doubt regarding filling empty areas of the board.
I read this thread:
http://archives.seul.org/geda/user/Nov-2006/msg00225.html and this
response: http://archives.seul.org/geda/user/Nov-2006/msg00227.html
which suggested setting the flag lines/arcs clear polygons. All I
found was Settings->New lines, arcs clear polygon. But that did not
work: I had a board already routed and I tried placing a rectangle on
the solder layer but it covered the routes and all I got was a full
covered board...

Is there some other option I have to set?

Thanks!
--
Donato Azevedo