Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
function EndRequestHandler(sender, args) {
    if (args.get_error() == undefined) {
        $(document).ready(function() {
        $(".modelExLink").colorbox({ width: "50%", inline: true, href: "#modelEx", speed: 1000 });
    });
    }
}