problem to get ckeditor text when use aspxtreelist with "callback on" from Devexpress ?

Dear Sir

i use AspxTreeList From Devexpress and when i click an node i can get text in my CKEditor , but when i click Update button in aspxtreelist i got CKEditor in my code with Empty String

        <dx:ASPxTreeList ID="ASPxTreeList1" runat="server" AutoGenerateColumns="False" EnableTheming="True"
            KeyFieldName="ClinicalCareID" Theme="MetropolisBlue"
            ParentFieldName="ParentID" ClientInstanceName="HT"
            OnCustomDataCallback="ASPxTreeList1_CustomDataCallback"
            Width="100%" OnHtmlRowPrepared="ASPxTreeList1_HtmlRowPrepared"
            OnNodeDeleting="ASPxTreeList1_NodeDeleting" OnNodeUpdating="ASPxTreeList1_NodeUpdating">
            <Columns>
                <dx:TreeListTextColumn FieldName="ClinicalCarePageTitle" VisibleIndex="0">
                </dx:TreeListTextColumn>
                <dx:TreeListCommandColumn VisibleIndex="1">
                    <EditButton Visible="True">
                    </EditButton>
                    <DeleteButton Visible="True">
                    </DeleteButton>
                </dx:TreeListCommandColumn>
            </Columns>
            <Settings ShowColumnHeaders="False" />
            <SettingsBehavior AllowFocusedNode="True" ExpandCollapseAction="NodeDblClick" AllowDragDrop="False" FocusNodeOnLoad="False" />
            <SettingsPager Mode="ShowPager">
            </SettingsPager>
            <SettingsDataSecurity AllowInsert="False" />
            <Styles>
                <FocusedNode Font-Bold="true" Font-Size="Small">
                </FocusedNode>
            </Styles>
            <ClientSideEvents FocusedNodeChanged="function(s, e) {var key = HT.GetFocusedNodeKey();HT.PerformCustomDataCallback(key);}"
                CustomDataCallback="function(s, e) {CKEDITOR.instances.ckeditor.setData(e.result);}" />
        </dx:ASPxTreeList>
        <br />
        <table style="width: 100%;">
            <tr>
                <td>
                    <table style="width: 100%;">
                        <tr>
                            <td style="border: 2px solid #0072C6; text-align: center; width: 150px; height: 35px;">
                                <dx:ASPxLabel ID="ASPxLabel1" runat="server" Text="New Main Sub Name:" Style="font-weight: 700">
                                </dx:ASPxLabel>
                            </td>
                            <td style="border: 2px solid #0072C6; height: 35px; text-align: center; padding-left: 5px;">
                                <dx:ASPxTextBox ID="ASPxTextBox1" runat="server" Font-Bold="True" Font-Size="Small" Height="30px" Width="350px" ClientInstanceName="HH">
                                    <ValidationSettings>
                                        <RequiredField ErrorText="You Must Enter Sub Name" IsRequired="True" />
                                    </ValidationSettings>
                                </dx:ASPxTextBox>
                            </td>
                        </tr>
                    </table>
                </td>
            </tr>
        </table>
        <br />
        <textarea id="ckeditor" name="ckeditor" class="ckeditor" cols="20" rows="2"></textarea>

C# Code To get ckeditor Text:

Request.Form["ckeditor"]

​now when i click update i got ckeditor text empty and that becouse callback is enable in AspxTreeList and i need it becouase i use callback to get data in my ckeditor.

so how can i get  ckeditor text when aspxtreelist doing callback , it work only if i disabale callback ?