Hi,

I have a hierarchical grid which is bound dynamically to a List<Utility> object list. The Utility object has a property List<UtilityRateDetail> UtilityRateDetailList So, I am trying to do a parent-child binding. I have the markup set up as follows:

<igtblh:WebHierarchicalDataGrid ID="gvUtilityDetail" runat="server" AutoGenerateColumns="False"
    DataKeyFields="ID" Height="350px" Width="100%" Font-Size="10pt">
    <ExpandCollapseAnimation SlideOpenDirection="Auto" SlideOpenDuration="300" SlideCloseDirection="Auto"
        SlideCloseDuration="300" />
    <ExpandButton ImageUrl="../../Images/Grid/Expand.gif"  AltText="+"></ExpandButton>
    <CollapseButton ImageUrl="../../Images/Grid/Collapse.gif" AltText="-">
    </CollapseButton>
    <Columns>
        <igtblh:BoundDataField DataFieldName="AccountNumber" Key="AccountNumber">
            <Header Text="Account #" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="Interval" Key="Interval">
            <Header Text="Interval" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="RateCode" Key="RateCode">
            <Header Text="Rate Code" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="ChargeType" Key="ChargeType">
            <Header Text="Charge Type" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="PreviousReadingDate" Key="PreviousReadingDate"
            DataFormatString="{0:d}" DataType="System.DateTime">
            <Header Text="Previous Reading" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="ReadingDate" Key="ReadingDate" DataFormatString="{0:d}"
            DataType="System.DateTime">
            <Header Text="Current Reading" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="UnitConsumption" Key="UnitConsumption" DataType="System.Double">
            <Header Text="Unit Consumption" />
        </igtblh:BoundDataField>
        <igtblh:BoundDataField DataFieldName="InvoiceCost" Key="InvoiceCost" DataFormatString="{0:c}"
            DataType="System.Decimal">
            <Header Text="Invoice Cost" />
        </igtblh:BoundDataField>
    </Columns>
    <Bands>
        <igtblh:Band Key="UtilityRateDetailList" AutoGenerateColumns="False" DataKeyFields="GuidUtilityRateDetail"
            DataMember="UtilityRateDetailList">          
            <Columns>
                <igtblh:BoundDataField Key="GuidUtilityRateDetail" DataFieldName="GuidUtilityRateDetail"
                    Hidden="true">
                    <Header Text="ID" />
                </igtblh:BoundDataField>
                <igtblh:BoundDataField DataFieldName="Parent" Key="Parent">
                    <Header Text="UtilityDetail" />
                </igtblh:BoundDataField>
                <igtblh:BoundDataField DataFieldName="RateName" Key="RateName">
                    <Header Text="Rate Name" />
                </igtblh:BoundDataField>
                <igtblh:BoundDataField DataFieldName="UnitCost" Key="UnitCost" DataFormatString="{0:c}"
                    DataType="System.Decimal">
                    <Header Text="Unit Cost" />
                </igtblh:BoundDataField>
                <igtblh:BoundDataField DataFieldName="LSCost" Key="LSCost" DataFormatString="{0:c}"
                    DataType="System.Decimal">
                    <Header Text="L.S. Cost" />
                </igtblh:BoundDataField>
            </Columns>
        </igtblh:Band>
    </Bands>   
</igtblh:WebHierarchicalDataGrid>

In my page load, I do this:

UtilityDetailList = UtilityDetailPresenter.GetAll().ToList();

gvUtilityDetail.DataSource = UtilityDetailList;

gvUtilityDetail.DataBind();

When I fire up the page, I don't see an expand button. Am I missing something? I have the images as well and I am not sure what I am missing.