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(AJAX Tab Container Error)htmlfile: Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus.

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In my aspx page, I have an ajax tab container control, and inside each tab strip,i have server controls.

During pageload,i want to set focus on a particular control but got this error during page load:
htmlfile: Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus.

the solution is in this page:
Setting focus to a textbox when in a tab panel errors

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