Ajax AsyncFileUpload is not work with TabContainer in Mozilla Firefox

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Ajax

In my web application need to use Ajax AsyncFileUpload control inside TabContainer .
But it is not working in mozilla. But working with IE, Chrome.

The issue is that visibility of both control not possible at a time.

To show TabContainer ,I set AsyncFileUpload visible= false. And in code behind set
AsyncFileUpload =true on button click. But when this code working then TabContainer disappeared.
What is the reason .