callback event not triggered in chrome browser
<p>I have an user control which updates some process using timer(which is as same as progress bar). The update progress will be handled by callback event. Now, in my aspx page there is my user control and  an asp:button. I triggered the timer of the control by clicking on the asp button. In the call back event i am updating the progress. The callback event gets fired in IE and Mozilla but not fired in chrome. Then below code is used to fire the callback event, </p>

<pre><code>var xmlRequest = new XMLHttpRequest();
var action = theForm.action;
var postData = __theFormPostData + "__CALLBACKID=" + 
(eventTarget)+ "&amp;__CALLBACKPARAM=" + "undefined";

xmlRequest.open("Post", action, true);
xmlRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");
xmlRequest.send(postData);
</code></pre>

<p>Please suggest any help on this.  </p>
