How to specify javascript to run when ModalPopupExtender is shown

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hmmm… I’m pretty sure that there’s a shown event for the MPE… this is off the top of my head, but I think you can add an event handler to the shown event on page_load

function pageLoad()
{
    var popup = $find('ModalPopupClientID');
    popup.add_shown(SetFocus);
}

function SetFocus()
{
    $get('TriggerClientId').focus();
}

i’m not sure tho if this will help you with calling it from the server side tho

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