IE9 RC, read the value of the object updated in showModalDialog

Hi,

I encountered in some problem:

(1) save following code as file "temp.html"

<script>
    function NewClass() {

        var m_DDLB = null;
    }
    var variable = new NewClass();  
    var retval = showModalDialog("temp2.html", variable);

    alert(variable.m_DDLB["temp"].xml);
</script>

(2) save following code as file "temp2.html"

<script>
var variable2;

 if(window.dialogArguments)
         {
          variable2 = window.dialogArguments;
         }
      variable2.m_DDLB = new Array();
      var ddlbArr = variable2.m_DDLB;

      var doc = new ActiveXObject("MSXML2.DOMDocument");
      doc.async = false
      doc.load("temp.xml");
      if (doc.parseError == 0) {
          ddlbArr["temp"] = doc.selectSingleNode("/root").cloneNode(true)
      }
 self.close();

</script>

(3) save following code as file "temp.xml"

<root>
   <node_id>checking</node_id>
</root>

When I execute code from temp.html in IE7, message box shows me the content of temp.xml.

When I execute code from temp.html in IE9, I did not get anything and in debug mode I can see that the value of the variable.m_DDLB["temp"] in temp.html is

variable.m_DDLB["temp"]              "Permission Denied"
  description                                  "Permission Denied"
  message                                    "Permission Denied"
  name                                          TypeError
  number                                       -2146828218
 
There is some problem in security that is different from the same security rules defined in previous versions.
 
Moreover I found another issue(see the link below), that was sing as  already corrected by Microsoft in the build 9.0.8112.16416
 
http://social.msdn.microsoft.com/Forums/en-US/iewebdevelopment/thread/61347684-49d4-459d-b29c-65e3b6c4a3ee  (*)
 
I think that my problem is the same, but I am working with build 9.0.8112.16421, and the problem described in (*) was not resolved.
Please consist.

Thanks,

Polina