radcombo with checkboxes

[Vikas]

I am having following markup for radCombo

<telerik:RadComboBox ID="rcbNewCategory" runat="server" Width="250px" Height="100px" Skin="Office2007"
                   AllowCustomText="true" ShowToggleImage="true" ShowMoreResultsBox="True" DataTextField="CategoryName" DataValueField="ID"
                    EnableLoadOnDemand="true"
                      EnableVirtualScrolling="true" HighlightTemplatedItems="true"  
                     Visible='<%# FillCategory(DataBinder.Eval( Container, "DataItem.ID")) %>' >
                    <ItemTemplate>
                        <div>
                        <asp:UpdatePanel ID="pnl2" runat="server">
                        <ContentTemplate>
                        <div onclick="stopPropagation(event)" >
                            <asp:CheckBox runat="server" ID="chkCat" Checked="false" OnCheckedChanged="chkCat_Changed"
                            ToolTip='<%# DataBinder.Eval(Container,"DataItem.CategoryName") %>' AutoPostBack="true"/>
                            <asp:Label runat="server" ID="Label2" Text='<%# DataBinder.Eval(Container,"DataItem.CategoryName") %>'>                                   
                            </asp:Label>
                            </div>
                            </ContentTemplate>
                            </asp:UpdatePanel>
                        </div>
                    </ItemTemplate>
                </telerik:RadComboBox>

It works fine. Even if i click inside checkbox, I can update the combobox Text with ";" seprated values.

But if i have to use ItemRequested event to show only 10 items at a time,
//OnItemsRequested="rcbNewCategory_ItemsRequested"
It fails on checkbox selection change event.
Reason:   ItemCount for combobox is always 0 at the server side.

Please can you tell me the quick solution. Do i am missing some property.
I was thinking to bind the control again at the page load. But how i will know the items that were bound before. Do i have to maintain status for it in viewstate or hidden field?

[Dimitar Terziev]

Hi Vikas,

Sorry for contacting you so late.

Unfortunately you couldn't use load on demand and server-side event of the CheckBox at the same time.
When a postback occur  the information from the combo is lost and nothing is preserved on the server.
One possible solution is to implement the logic of the server-side event of the CheckBox into a client side event or not to use load on demand of the ComboBox.
 
Best wishes,
Dimitar Terziev
the Telerik team