Change Title of Modal Dialog Box

Hi all,

I am attempting to change the title of the display form modal dialog box. What's odd is that it works in the console after load, but doesn't execute to change the title of the modal.

$(document).ready(function () {
    //Set the title of the dialog box to my field    

var myField = $('h3:contains("My Field Name")').closest('td').next('td').text();
    $('#dialogTitleSpan').html(myField);

});

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