PopUp new page in aspx using Jquery easyUI

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ASP.NET

jQuery

Hi everybody. I am using Jquery easyUI to open dialog new page in ASPX.

$('<div  class="easyui-dialog" style="width:900px;height:600px"></div>')
              .html('<iframe id="myFrame" width="100%" height="100%" frameborder="0" src= "App_form/ktht/kt_ma_tk.aspx" marginwidth="0" marginheight="0"></iframe>')
              .dialog({
                  title: "",
                  closed: false,
                  cache: false,
                  modal: false
              });

Bút ít have a problems, it load page kt_ma_tk two times

if (!IsPostBack)
{

// It run double
}

I dont understand why

Thanks to support