Posted 10 September 2017, 11:44 am ESTThis seems to be a common problem among combobox's rendered inside a hidden element. I have had this same issue with four other combobox's that I've tried to use. Also one that Peter Blum has fixed on of AJAX control toolkit.
So the problem is, I have a div that is basically functions like a modal popup (via jQuery). So basically the content is hidden on page load. So, when the page renders, the combobox doesn't know the correct width and height based on the DOM. Do you guys have a workaround for this?