use `.focus` configuration option.

mockup/alert.html

@@ -23,7 +23,7 @@
 <script>
     $(function () {
         $('#showalert1').click(function () {
-            var alert = new QfqNS.Alert("This is alert 1", 'error', [{label: "OK", eventName: "ok"},
+            var alert = new QfqNS.Alert("This is alert 1", 'error', [{label: "OK", eventName: "ok", focus: true},
                 {label: "Cancel", eventName: "cancel"}]);
             alert.on('alert.ok', function () {
                 console.log("OK button alert 1");