i am using UltraWebGrid its version is Infragistics4.WebUI.UltraWebGrid.v10.3, Version=10.3.20103.2120

my grid is looks like this:

<igtbl:UltraWebGrid ID="nauwgProd" runat="server" SkinID="nauwgGridXml" OnInitializeRow="nauwgProd_InitializeRow">

    <Bands>

      <igtbl:UltraGridBand Key="Product" BaseTableName="Product" CellClickAction="Edit">

        <Columns>

          <igtbl:UltraGridColumn Key="thumb_image" Width="5%" BaseColumnName="thumb_image" AllowUpdate="No">

            <Header Key="thumb_image" Caption="Img" />

            <CellStyle HorizontalAlign="Center" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="pf_id" Width="15%" BaseColumnName="pf_id" AllowUpdate="No" Type="HyperLink">

            <Header Key="pf_id" Caption="Product ID" />

            <CellStyle Font-Bold="true" ForeColor="Blue" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="sku" Width="15%" BaseColumnName="sku" AllowUpdate="No">

            <Header Key="sku" Caption="Sku" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="name" Width="45%" BaseColumnName="name" AllowUpdate="No">

            <Header Key="name" Caption="Name" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="list_price" Width="10%" BaseColumnName="list_price" AllowUpdate="No">

            <Header Key="list_price" Caption="Base Price" />

            <CellStyle HorizontalAlign="Right" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="stock" Width="10%" BaseColumnName="stock" AllowUpdate="No" Type="Custom" EditorControlID="naneStock">

            <Header Key="stock" Caption="Stock" />

            <CellStyle HorizontalAlign="Right" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="stock_backup" BaseColumnName="stock" ServerOnly="true" />

          <igtbl:UltraGridColumn Key="enable_att_inventory" BaseColumnName="enable_att_inventory" ServerOnly="true" />

        </Columns>

      </igtbl:UltraGridBand>

      <igtbl:UltraGridBand Key="Attribute" BaseTableName="Attribute" CellClickAction="Edit">

        <Columns>

          <igtbl:UltraGridColumn Key="pf_stock_id" Width="40%" BaseColumnName="pf_stock_id" AllowUpdate="No">

            <Header Key="pf_stock_id" Caption="Attribute Sku" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="pf_att1" Width="25%" BaseColumnName="pf_att1" AllowUpdate="No">

            <Header Key="pf_att1" Caption="Attribute 1" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="pf_att2" Width="25%" BaseColumnName="pf_att2" AllowUpdate="No">

            <Header Key="pf_att2" Caption="Attribute 2" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="stock_qty" Width="10%" BaseColumnName="stock_qty" AllowUpdate="Yes" Type="Custom" EditorControlID="naneStock">

            <Header Key="stock_qty" Caption="Stock" />

            <CellStyle HorizontalAlign="Right" BackColor="#FFFF99" CssClass="GridEditableCell" />

          </igtbl:UltraGridColumn>

          <igtbl:UltraGridColumn Key="stock_qty_backup" BaseColumnName="stock_qty" ServerOnly="true" />

        </Columns>

      </igtbl:UltraGridBand>

    </Bands>  

    <DisplayLayout ViewType="Hierarchical" GroupByBox-Hidden="true" >

      <RowExpAreaStyleDefault></RowExpAreaStyleDefault>

    </DisplayLayout>

  </igtbl:UltraWebGrid>

in IE9 it looks like this :

in IE9 we can edit the stock of attibutes.

in IE8 it looks like this :

in IE8 we can not change the value of the stock of attibutes.

and attribute table is also shrinks.

In IE7 and IE9 it works properly but not in IE8.