title: Page doesn't postback if it has validation control after deployment
body: <p>I have a page with a RadioButtonList which should post back when the selection is changed. But because of RequiredFieldValidator on the page, the postback is not happening.
  It is working fine on //localhost/ but not after deployment to production server.</p>
  
  <p>The error on the page is:
  'event' is null or not an object
  <br>Line: 126
  Char: 5
  Code: 0</p>
  
  <p>URI: <a href="http://web-dev:90/aspnet_client/system_web/2_0_50727/WebUIValidation.js" rel="nofollow">http://web-dev:90/aspnet_client/system_web/2_0_50727/WebUIValidation.js</a></p>
  
  <p>A few things which I have already tried:</p>
  
  <p>1) aspnet_client folder is in its proper place.</p>
  
  <p>2) I have added <code>Page.Validate() and if(Page.IsValid){}</code> statements with the button on whose click the validation should happen.</p>
  
  <p>3) The ValidatorCommonOnSubmit function in <code>WebUIValidation.js</code> file looks like this:
  <pre><code>
     function ValidatorCommonOnSubmit() {
      event.returnValue = !Page_BlockSubmit;
     Page_BlockSubmit = false;
     return event.returnValue;}
  </pre></code>
  Can somebody help me with this? Any help would be appreciated. Thanks!!</p>