Problem with RadCombobox ItemRequest Event in Radgrid

[Lokesh]

Hi Team,
I have a radgrid with a radcombobox in EditItemTemplate.
When for the first time I click the mouse on RadCombo, ItemRequest event fires and shows me tha data.
But when I input the Text in it, it doesnt fire the event again.

This is my aspx :

<telerik:RadGrid ID="rgCSTaskComponents" runat="server"
            OnNeedDataSource="rgCSTaskComponents_NeedDataSource"
            OnInsertCommand="rgCSTaskComponents_InsertCommand"
            OnUpdateCommand="rgCSTaskComponents_UpdateCommand"
            OnDeleteCommand="rgCSTaskComponents_DeleteCommand"
            OnItemCommand="rgCSTaskComponents_ItemCommand"
            OnItemDataBound="rgCSTaskComponents_OnItemDataBound"
            OnItemCreated="rgCSTaskComponents_ItemCreated"
            AutoGenerateColumns="False" PageSize="15" AllowFilteringByColumn="true"
            PagerStyle-AlwaysVisible="true" PagerStyle-Mode="NextPrevAndNumeric">
           <MasterTableView  AutoGenerateColumns="False" DataKeyNames="CSTaskComponentID" DataMember="CSTaskComponents"
                            CommandItemDisplay="Top">
             <ExpandCollapseColumn Visible="False">
                <HeaderStyle Width="20px" />
             </ExpandCollapseColumn>
             <EditFormSettings>
                 <EditColumn UniqueName="EditCommandColumn">
                </EditColumn>
            </EditFormSettings>
            <Columns>
            <telerik:GridTemplateColumn HeaderText="Part Item" UniqueName="PartItem"  DataField="DisplayName"
                      DataType="System.String"  AutoPostBackOnFilter="true" CurrentFilterFunction="Contains"
                                                         FilterControlWidth="80%">
                    <ItemTemplate>
                        <asp:Label ID="lbl_DisplayName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "DisplayName")%>'>
                        </asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                             <telerik:RadComboBox ID="rcbSKU" runat="server"
                                             AutoPostBack="true"
                                             Width="180px"
                                             MarkFirstMatch="true"
                                             DataTextField="DisplayName"
                                             DataValueField="PartItemID"
                                             OnItemsRequested="rcbSKU_ItemsRequested"
                                             EnableLoadOnDemand="true"
                                             ShowMoreResultsBox="true"
                                             ItemRequestTimeout="5"
                                             AllowCustomText="true" >
                           </telerik:RadComboBox>
                    </EditItemTemplate>
                    <HeaderStyle HorizontalAlign="Left" Width="40%" />
                    <ItemStyle HorizontalAlign="Left" Width="40%" />
                </telerik:GridTemplateColumn>

        </Columns>
                </MasterTableView>
            </telerik:RadGrid>

and this is my cs side :

protected void rcbSKU_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)
      {
          LoadSKUForDropDown();
          //RadComboBox rcbSKU = rgCSTaskComponents.MasterTableView.Items[0].FindControl("rcbSKU") as RadComboBox;
          RadComboBox rcbSKU = (RadComboBox)o;
          rcbSKU.Items.Clear();
          string text = e.Text;

          try
          {
              DataRow[] rows = mSKUDataTable.Select("DisplayName LIKE '" + text + "*'", "DisplayName");

              int itemsPerRequest = 10;
              int itemOffset = e.NumberOfItems;
              int endOffset = itemOffset + itemsPerRequest;
              if (endOffset > rows.Length)
              {
                  endOffset = rows.Length;
              }

              for (int i = itemOffset; i < endOffset; i++)
              {
                  rcbSKU.Items.Add(new RadComboBoxItem(rows[i]["DisplayName"].ToString(), rows[i]["PartItemID"].ToString()));
              }
              if (rows.Length > 0)
              {
                  e.Message = String.Format("Items <b>1</b>-<b>{0}</b> out of <b>{1}</b>", endOffset.ToString(), rows.Length.ToString());
              }
              else
              {
                  e.Message = "No matches";
              }
          }
          catch (Exception ex)
          {
              ex.Source = this.AppRelativeVirtualPath;
              e.Message = "No matches";
          }
      }

Waiting for your positive and quick reply,
Regards,
Lok..