Applescript help

[AntToeKnee.9604432 at bloglines.com]

Hello,

I'm pretty new to applescript but have a lot of programming experience.
 I'm trying to delete the selected row in an outline, using;

tell front
document of application "OmniOutliner Professional"
  delete selected row

end tell

But nothing happens.  If I vary the script to 

tell front
document of application "OmniOutliner Professional"
  delete every row
end
tell

they all get deleted.  What am I doing wrong?  I'm using the latest
OO3 Pro under Jaguar (I've ordered Tiger so can wait if it is a OS version
thing)

Also, generally how to I find what applescript bindings are available
for a particular application?  In the case of Omnioutliner I can find no mention
of the objects specific to that application.  Surely there must be per-app
documentation?

-thanks