ASP.Net RadioButtons in UpdatePanel CheckChanged event not working

No sir. It dosen't hit any break point...

Will catch break point on page load and when I click on radio2 button, but when i click on radio1 button again then it doesn't goes to break point and not even it's event get fired..

Do you mean that you have issue with Radio1 and there is not issue with radio2 ..?

Sir,

problem is there with both radiobuttons. because radio2 event is firing but not radio1.

Not without postback and even not with postback.

Hi, there..,

I have checked your this code on my machine, It works. At least the Event fired as whenever it should be.

So there is nothing wrong with this code regarding the Event. Are you using any javaScript of jQuery or any other Scripting language. ...?

Sir,

 actually within Update Panel I have used a Tabbing javascript. So there are 4 tabs. and at one of those tab I have placed these two radio buttons, thats the way actually I need... 

For tabbing I am using the following script:

 http://www.dynamicdrive.com/dynamicindex17/tabcontent_suppliment.htm