Structure and URL Segment Variables

I’m madly in love with the Structure extension. I’ve almost finished building (the bare bones) of my first site in EE. In the last template, I want to use the URL Segment Variable feature of EE, but I can’t seem to get it to work.

My “course info” page shows up fine at

http://foo.com/curriculum/foundation/internet-fundamentals/

So I thought I could just add url_title=”{segment_4} like so:

{exp:weblog:entries weblog="courses" url_title="{segment_4}”}

And then add on the word /comp/ to the end of the URL in the browser address bar

http://foo.com/curriculum/foundation/internet-fundamentals/comp/

And I expected to land on the same page..but with the additional info of “comp” available to me in segment_4…so I could choose to display specific “comp”-like info on that page.

But …when I go to http://foo.com/curriculum/foundation/internet-fundamentals/comp/, it doesn’t work…EE thinks http://foo.com/curriculum/foundation/internet-fundamentals/comp/ doesn’t exist.

Is the URL Segment Variable feature available to me if I’m using the Structure Extension? If so, is there some special syntax or a setting I need to correct?