Issue in implementing partial postback of Rad panel bar in webpart

Hello Guys,

i tried  implementing partial postback of RadPanelBar on click of a button. After analysis, I found that inside updatePanel, RadPanel Bar expand/collapse doesn’t workin a webpart. The same thing I tried in ASP.NET, it worked.

Any suggestion on this is most welcome. I have a small code snippet available. Let me know if i can share  attachment (5 MB) in this forum.