Popup class name and UI Automation

Hi all,

This is regarding IE9 popup automation. I am not able to get the DOM element for IE9 popup. Earlier i was using "Internet Explorer_TridentDlgFrame" class name and through FindWindowA method of User32 dll to get the DOM but using the name I am not able to get the DOM now. I am trying this from last week but unsuccessful. Can I get help from anyone regarding this?