title: ajaxToolkit:CalendarExtender losses data @ postbacks
body: <p>Frens,</p>
  
  <p>i have a textbox with ajaxToolkit:CalendarExtender which losses data when i chose radio buttons ....
  please read my code...</p>
  
  <pre><code>&lt;asp:UpdatePanel ID="uppnl_Select_File_Format" runat="server" UpdateMode="Conditional"&gt;
    &lt;ContentTemplate&gt;
      &lt;div class="input-field-box-container"&gt;
        &lt;asp:TextBox ID="txtExpiryDate" runat="server" 
              SkinID="FormInputTextBox" ReadOnly="true"
              ValidationGroup="PublishUser"&gt; &lt;/asp:TextBox&gt;
        &lt;ajaxToolkit:CalendarExtender ID="ajax_Expiry_Date" runat="server" TargetControlID="txtExpiryDate"&gt;
        &lt;/ajaxToolkit:CalendarExtender&gt;
       &lt;/div&gt;
       &lt;div class="input-field-box-container"&gt;
        &lt;asp:RadioButton ID="rbtnEnabled" GroupName="Print" Text="Enable" runat="server"
              AutoPostBack="true" 
              OnCheckedChanged="rbtnEnabled_CheckedChanged" CssClass="checkbox-auto"
              Width="220px" /&gt;
        &lt;asp:RadioButton ID="rbtnDisabled" 
              GroupName="Print" Text="Disable" runat="server"
              AutoPostBack="true" OnCheckedChanged="rbtnDisabled_CheckedChanged" CssClass="checkbox-auto"
              Width="220px" /&gt;
      &lt;/div&gt;
   &lt;/ContentTemplate&gt;
      &lt;Triggers&gt;
         &lt;asp:PostBackTrigger ControlID="btnCreate" /&gt;
         &lt;asp:AsyncPostBackTrigger ControlID="ajax_Expiry_Date" /&gt;
      &lt;/Triggers&gt;
  &lt;/asp:UpdatePanel&gt;
  </code></pre>