<p>Ok, so I got my extender working on a default.aspx page on my website and it looks good.  I basically copied and pasted the code for it into a user control control.ascx page.  When I do this I completely loose the functionality (just shows the target control label and no dropdown, even upon hover).  Is there any reason why it doesn't work in a custom user control inside a masterpage setup?</p>

<p>Edit:
Didn't quite do the trick.  Any other suggestions?
Its in a master page setup, using eo web tabs (I tried it inside the tabs and outside the tabs but on the same page as the tabs, to no avail), and its in a custom user control.  Think there are dependency issues?</p>

Check the DocType.  Here is what I have found useful
```
```
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" >
```
```
Place this in your user control (or the page that uses it) and all should be well.  I had a similar problem with a collapsible extender and this worked for me.
Edit: Here is a
link
to my question for further details.