title: DropdownList not refreshing in IE11 but refreshes with Enterpise mode
body: <p>I have DropdownList in my ASP.NET webform which does not autopostback on change.</p>
  
  <p>It works if I select Enterprise Mode or I open it in Firefox.</p>
  
  <p>What am I missing here?</p>
  
  <p>Code:</p>
  
  <pre><code>&lt;asp:DropDownList ID="FormatsDropDownList"
                  runat="server"
                  OnSelectedIndexChanged="FormatsDropDownList_SelectedIndexChanged" 
                  AutoPostBack="true"&gt;
                  &lt;asp:ListItem Text="Item1" Value="Value1" Selected="True"&gt;&lt;/asp:ListItem&gt;
                  &lt;asp:ListItem Text="Item2" Value="Value2"&gt;&lt;/asp:ListItem&gt;&lt;/asp:ListItem&gt;
              &lt;/asp:DropDownList&gt; 
  </code></pre>