Ive been following this tutorial here:

http://doc.silverstripe.org/private:tutorial:creating-a-module?s=extending%2520admin%2520area

However, when i get to the end of it, no link appears in my CMS navigation menu. I had to add the following code to the top of my extention of LeftAndMain:

static $url_segment = 'random-links';

This makes the 'Random Links' tab come up in the Navigation Menu. But when i go to that tab and then click on 'Create New Link' the text dissappears out of the right pane of the admin panel and my form to add a new link does not appear.

Has anyone else out there done this tutorial and got it working?

Cheers,
Craig.