Tabs and popup windows

Tabs and popup windows

I am using JQuery UI Tabs. I have a tab that open a popup window. It doesn't switch to the clicked tab or display it's content. It should just open the popup window. 

When you click it, it will popup the window fine. The problem is that it will switch to the clicked tab and display the current page. I want it to just open a popup window and stay on the current tab.

This was working fine for jqueryui-1.8.3. Upgraded to jqueryui-1.9.1 and now running into this problem.

<li><a href="#" onclick=" BigPopUp('url'') ">Events</a></li>

Kinda hard to fine any example since jqueryui-1.9.1 is new. And API documentation isn't any help.