HTML editor gives empty value in code behind after postback
<p>I have multy control and a <a href="http://htmleditor.codeplex.com/" rel="nofollow">HtmlEditor</a> in the page.</p>

<pre><code> &lt;asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always"&gt;
    &lt;Triggers&gt;
        &lt;asp:PostBackTrigger ControlID="SaveButton" /&gt;
    &lt;/Triggers&gt;
    &lt;ContentTemplate&gt;
    &lt;cc1:TabContainer CssClass="visoft__tab_xpie7" runat="server" ID="tab" ActiveTabIndex="0" Width="100%" Font-Size="11px"&gt;
     &lt;cc1:TabPanel runat="server" HeaderText="اطلاعات پایه" ID="TabPanel1"&gt;
         &lt;ContentTemplate&gt;
          &lt;div class="row"&gt;
           &lt;span style="width: 100px" class="rowtitle"&gt;Category&lt;/span&gt;
           &lt;asp:DropDownList ID="CategoryDropDownList" runat="server" Width="200px" AutoPostBack="True" DataTextField="Name" DataValueField="ID" OnSelectedIndexChanged="CategoryDropDownList_SelectedIndexChanged" /&gt;
           &lt;asp:RequiredFieldValidator ID="CategoryRFV" runat="server" ControlToValidate="CategoryDropDownList" ForeColor="Red" ValidationGroup="Save" ErrorMessage="مجموعه را انتخاب کنید." Text="*" /&gt;
          &lt;/div&gt;

          &lt;div class="row" style="height: 300px"&gt;
           &lt;span style="width: 100px" class="rowtitle"&gt;توضیحات کامل&lt;/span&gt;
           &lt;editor:HtmlEditor Style="float: left" runat="server" Width="600px" ID="DescriptionHtmlEditor" /&gt;
           &lt;asp:RequiredFieldValidator Text="*" ID="DescriptionRFV" runat="server" ControlToValidate="DescriptionHtmlEditor" ForeColor="Red" ValidationGroup="Save" ErrorMessage="توضیحات را وارد کنید ." /&gt;
           &lt;/div&gt;
         &lt;/ContentTemplate&gt;
        &lt;/cc1:TabPanel&gt;
&lt;/cc1:TabContainer&gt; 
 &lt;div class="row" style="text-align: center"&gt;
   &lt;asp:Button ID="SaveButton" class="button" Width="100px" OnClick="SaveButton_Click" runat="server" ValidationGroup="Save" Text="ذخیره" /&gt;
 &lt;/div&gt;
 &lt;/ContentTemplate&gt;
&lt;/asp:UpdatePanel&gt;
</code></pre>

<p>All controls are located inside an UpdatePanel.</p>

<p>when i was trying to access the HTML editors 
text property after a partial postback of an updatepanel, it was empty.</p>

<pre><code>  protected void OrderImageDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
     string description=  DescriptionHtmlEditor.Text;//value is empty.
 }
</code></pre>
