Selection out of range -not in grid or form

[Robot B9]

I have combobox that is EnableAutomaticLoadOnDemand=true
It is not in a grid or a form, and the object and events for the combo are available via the .NET code pickboxes.
Every so often the Selection out of range Parameter name: value  exception will rear it's ugly head.
I was driving three other radgrid on my page without problem. This exception will show weather the combo is part of hte ajaxmanager or not. I read that clearing the combo will solve this, but all this is set to automatic.
See combo config below:

<telerik:RadComboBox runat="server" ID="ddlEmployee" DataSourceID="dsEmployeeID"
                            EmptyMessage="Select an Employee"
                            skin="Vista"
                            DataTextField="txt"
                            DataValueField="EmpID"
                            Width="300px"
                            DropDownWidth="350px"
                            CausesValidation="false"
                            AutoPostBack="True"
                            EnableVirtualScrolling="true"
                            Filter="Contains"
                            EnableAutomaticLoadOnDemand="true"
                            HighlightTemplatedItems="true"
                            ShowMoreResultsBox="true"
                            AllowCustomText="true"
                            MarkFirstMatch="true"
                            SortCaseSensitive="False"
                            ItemsPerRequest="20">
                            <HeaderTemplate>
                                <table style="width: 350px; text-align: left">
                                    <tr>
                                        <td style="width: 110px;">Last Name</td>
                                        <td style="width: 110px;">First Name</td>
                                        <td style="width: 130px;">Employee ID</td>
                                    </tr>
                                </table>
                            </HeaderTemplate>
                            <ItemTemplate>
                                <table style="width: 315px; text-align: left">
                                    <tr>
                                        <td style="width: 125px;">
                                            <%#DataBinder.Eval(Container.DataItem, "LName")%>
                                        </td>
                                        <td style="width: 125px;">
                                            <%#DataBinder.Eval(Container.DataItem, "FName")%>
                                        </td>
                                        <td style="width: 100px;">
                                            <%#DataBinder.Eval(Container.DataItem, "EmpID")%>
                                        </td>
                                    </tr>
                                </table>
                            </ItemTemplate>
                        </telerik:RadComboBox>

[Dimitar Terziev]

Hello Mark,

The mark-up of the RadComboBox seems right and I there is not obvious reason for the received exception. Please open a support ticket and provide a runnable sample with the issue being reproduced so I could troubleshoot it locally.

Greetings,
Dimitar Terziev
the Telerik team

[Robot B9]

It is ok.
This is a non-issue. I should've trouble-shooted this item further, which I did.
It was a rad combo box on the page, but not the one that I posted above. I had forgotten that I had added another to the page and it was in a formview. This one was causing the page error because the data in the form record was not in the combobox for a particular field. It is working beautifully now.
Thank you.