I have q grid like this

    <ig:WebHierarchicalDataGrid ID="grid" runat="server" Height="400px"
        Width="99%" DataKeyFields="IdModulo" AutoGenerateColumns="False" EnableDataViewState="True"
        OnInitializeRow="gridJerarquicoModulos_InitializeRow">
        <Columns>
            <ig:BoundDataField DataFieldName="IdModulo" Hidden="True" Key="IdModulo">
                <Header Text="IdModulo" />
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Nombre" Key="Nombre">
                <Header Text="Nombre" />
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Codigo" Key="Codigo">
                <Header Text="Código" />
            </ig:BoundDataField>
        </Columns>
        <Bands>
            <ig:Band DataKeyFields="IdModuloVersion" AutoGenerateColumns="false" DataMember="Versiones">
                <Columns>
                    <ig:BoundDataField DataFieldName="IdModuloVersion" Hidden="True" Key="IdModuloVersion">
                        <Header Text="IdModuoVersion" />
                    </ig:BoundDataField>
                    <ig:BoundDataField DataFieldName="IdModulo" Hidden="True" Key="IdModulo">
                        <Header Text="IdModulo" />
                    </ig:BoundDataField>
                    <ig:BoundDataField DataFieldName="Version" Key="Version">
                        <Header Text="Versión" />
                    </ig:BoundDataField>
                    <ig:BoundDataField DataFieldName="FechaInicioModulo" Key="FechaInicioModulo">
                        <Header Text="Inicio" />
                    </ig:BoundDataField>
                    <ig:TemplateDataField Key="Vigente">
                        <ItemTemplate>
                            <asp:CheckBox ID="chkVigente" runat="server" Enabled="False" />
                        </ItemTemplate>
                        <Header Text="Activo" />
                    </ig:TemplateDataField>
                </Columns>
            </ig:Band>
        </Bands>
        <Behaviors>
            <ig:RowSelectors EnableInheritance="true" RowNumbering="true">
            </ig:RowSelectors>
            <ig:Activation>
            </ig:Activation>
            <ig:Selection CellClickAction="Row" RowSelectType="Single" Enabled="True">
            </ig:Selection>
        </Behaviors>

    </ig:WebHierarchicalDataGrid>

And my code behind to bind the grid is:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            datasourceH.DataViews.Add(
                    new DataView()
                    {
                        ID = "Modulos",
                    });
                datasourceH.DataViews.Add(
                   new DataView()
                   {
                       ID = "Versiones",
                   });

                datasourceH.DataRelations.Add(new DataRelation("Modulos", "IdModulo", "Versiones", "IdModulo"));

datasourceH.DataViews[0].DataSource = ColModulos; //ColModulos is IList
        datasourceH.DataViews[1].DataSource = ColVersionesModulos; //ColVersionesModulos is IList
        grid.DataSource = datasourceH;
        grid.DataBind();
            }
    }

protected void gridJerarquicoModulos_InitializeRow(object sender, RowEventArgs e)
    {
        if ((e.Row.DataItem as WebHierarchyData).Item is ModuloVersion)
        {
            (e.Row.Items[4].FindControl("chkVigente") as CheckBox).Checked = ((e.Row.DataItem as WebHierarchyData).Item as ModuloVersion).Vigente;
        }
    }

After the grid is loaded, when I expand the first parent row, no problems, but when I try to expand the second parent row I get an error "Unable to cast 'Infragistics.Web.UI.Framework.Data.DataRecord' to 'System.Web.UI.IHierarchyData'."

Thanks in advance for any help. Please I need this urgent, I have a presentation today.