Unable to access Telerik radcombobox object in document onload in JavaScript in IE only

  javascript, jquery, radcombobox, telerik

When I try to access the Telerik radcombobox in document Onload, I am receiving the object as null in IE11 only. (works in edge, chrome and Firefox)

what is the best approach to access the radcombobox in document onload for IE.

$(document).ready(function () {
        var combo = $find("<%=radcombobox.ClientID%>");
        var items = combo.get_items();

Error: combo is Null

Source: Ask Javascript Questions