The error I get is the following:Provided field of type 'Infragistics.Web.UI.GridControls.GridField' cannot be added to the columns collection. Only BoundDataField or TemplateDataField fields are supported.

<div id="WebTab">
            <asp:UpdatePanel ID="WebTabUpdatePanel" runat="server">
                <ContentTemplate>   
                    <ig:WebTab ID="WebTab1" runat="server" Height="200px" Width="300px">
                        <AjaxIndicator Enabled="True" Location="MiddleCenter" />
                        <Tabs>
                            <ig:ContentTabItem runat="server" Text="Tab 1">
                            </ig:ContentTabItem>
                        </Tabs>
                        <ContentPane>
                            <RoundedBackground Enabled="true" />
                        </ContentPane>
                    </ig:WebTab>
                </ContentTemplate>
            </asp:UpdatePanel>
        </div>
        <div id="push"></div>
    </div>

 protected void AddNewTab(Infragistics.Web.UI.NavigationControls.DataMenuItemEventArgs e)
        {
            string usrCntrl = e.Item.Value.ToString();
            if (!string.IsNullOrEmpty(usrCntrl))
            {
                //add a new tab to the main WebTab control and load the target user control
                ContentTabItem ctab = new ContentTabItem();
                ctab.UserControlUrl = usrCntrl;
                ctab.Text = e.Item.Text;
                WebTab1.Tabs.Add(ctab);
                WebTab1.SelectedIndex = WebTab1.Tabs.IndexOf(ctab);
            }
        }