Need an event that occurs after dialog 'open'

Need an event that occurs after dialog 'open'

I have a dialog box that contains a list which is created and filled via an AJAX call when the dialog box is created.  I'm using a tooltip plugin (cluetip) which is supposed to display additional information.
 
The problem is that I can't find single event to create the tooltip plugin which works correctly.  For example,
- if I create the tooltip elements on the dialog 'open' event it's too early. That is the tooltips are not created.
- if I create the tooltip elements on some event like 'mouseenter', it works the first time but on the second mouseenter and creation of the tooltip elements all of the information is lost.
- As a test I put a link on the page to create the tooltip elements just once and everything works as it should.  That is, I can hover over the li elements repeatedly with the correct result.
 
So I need to detect when the list has been successfully rendered and then create the tooltip plugin just once.  I'd appreciate any ideas on how to do this.
 
Thanks.
David