Upadate panel's child controls are not causing partial postback, the whole page gets reloaded with a flick

I have put several buttons and panels in my update panel. I also have a script manager on that page. now when I click on any of the buttons then the functionality is working fine but problem is that the complete page gets reloaded witha a flick, instead of updating the update panel only开发者_如何学JAVA. I have set the "children as trigger" property of update panel "true".

please help.

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