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Panel show popup model blink!

Posted By:      Posted Date: October 27, 2010    Points: 0   Category :ASP.Net

I have a panel containing one image, and i use Ajax ModalPopupExtender for show panel when I click button. After I clicked button first, all so good. But, after I refresh or do event on page, panel is show and then hidden about 1s. Can you help me! Thanks all..

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