What properties in the ultrawebgrid cause the updatecell event to fire?

I had a grid that was working perfectly in 2008 v2 and then I updated to 2008 v3 and now it works differently. 

 In my grid, I only have one visible column.  When the user clicks a cell and it goes into edit mode (uses the webcurrencyedit control).  When they exit the cell, it should update (i.e. fire the gridname_updatecell event).  It works fine on the first row.  On any other row, it does not fire.  Here is the relevant datagrid code.

<igtbl:UltraWebGrid ID="uwgDepositList" runat="server" DataSourceID="dsDepositItems" Height="134px" Width="145px" onupdatecell="uwgDepositList_UpdateCell" DataKeyField="ItemID" oninitializelayout="uwgDepositList_InitializeLayout" >
<Bands>
<igtbl:UltraGridBand DataKeyField="ItemID" AllowUpdate="Yes">
<Columns>
<igtbl:UltraGridColumn BaseColumnName="ItemID" DataType="System.Decimal" IsBound="True" Key="ItemID" Hidden="True">
<Header Caption="ItemID"></Header>
</igtbl:UltraGridColumn>

DataType="System.Decimal" Format="$ ###,###,##0.00 " AllowUpdate="Yes">

<Header Caption="Amount">

<RowLayoutColumnInfo OriginX="8" />

</Header>

<CellStyle HorizontalAlign="Right">

</CellStyle>

<Footer>

<RowLayoutColumnInfo OriginX="8" />

</Footer>

</igtbl:UltraGridColumn>

</Columns>

<RowTemplateStyle BackColor="White" BorderColor="White" BorderStyle="Ridge">

WidthTop="3px" />

</RowTemplateStyle>

<AddNewRow View="NotSet" Visible="NotSet">

</AddNewRow>

</igtbl:UltraGridBand>

</Bands>

RowHeightDefault="20px" StationaryMarginsOutlookGroupBy="True"

AutoGenerateColumns="False" CellClickActionDefault="Edit"

RowSelectorsDefault="No">

Font-Size="8pt" Height="134px" Width="145px">

</FrameStyle>

<RowAlternateStyleDefault BackColor="#FFFFC0">

<Padding Left="3px" />

<BorderDetails ColorLeft="255, 255, 192" ColorTop="255, 255, 192" />

</RowAlternateStyleDefault>

<EditCellStyleDefault BorderStyle="None" BorderWidth="0px">

</EditCellStyleDefault>

<FooterStyleDefault BackColor="LightGray" BorderStyle="Solid" BorderWidth="1px">

WidthTop="1px" />

</FooterStyleDefault>

<HeaderStyleDefault BackColor="LightGray" BorderStyle="Solid">

WidthTop="1px" />

</HeaderStyleDefault>

Font-Names="Verdana" Font-Size="8pt">

<Padding Left="3px" />

<BorderDetails ColorLeft="White" ColorTop="White" />

</RowStyleDefault>

<AddNewBox>

<BoxStyle BackColor="LightGray" BorderStyle="Solid" BorderWidth="1px">

WidthTop="1px" />

</BoxStyle>

</AddNewBox>

<ActivationObject BorderColor="Black" BorderWidth="">

</ActivationObject>

<FilterOptionsDefault>

BorderWidth="1px" CustomRules="overflow:auto;"

Font-Names="Verdana,Arial,Helvetica,sans-serif" Font-Size="11px" Width="200px">

<Padding Left="2px" />

</FilterDropDownStyle>

<FilterHighlightRowStyle BackColor="#151C55" ForeColor="White">

</FilterHighlightRowStyle>

BorderStyle="Solid" BorderWidth="1px" CustomRules="overflow:auto;"

Font-Names="Verdana,Arial,Helvetica,sans-serif" Font-Size="11px">

<Padding Left="2px" />

</FilterOperandDropDownStyle>

</FilterOptionsDefault>

</DisplayLayout>

</igtbl:UltraWebGrid>