Don't know if this helps, but here is the ASP for one of my grids that is rebinding without calling grid.Databind();

<igtbl:UltraWebGrid ID="uwgRDSpread" runat="server" Width="100%" Browser="Auto" DataSourceID="RDSpreadDataSource" OnDataBound="uwgRDSpread_DataBound">
                                     <bands>
                                        <igtbl:UltraGridBand >
                                            <Columns>
                                   
                                                <igtbl:TemplatedColumn Key="sql" Hidden="true">
                                                    <Header>
                                                        <RowLayoutColumnInfo OriginX="3" />
                                                    </Header>
                                                </igtbl:TemplatedColumn>
                                            </Columns>
                                            <RowTemplateStyle BackColor="Window" BorderColor="Window" BorderStyle="Ridge">
                                                <BorderDetails WidthBottom="3px" WidthLeft="3px" WidthRight="3px" WidthTop="3px" />
                                            </RowTemplateStyle>
                                           
                                         </igtbl:UltraGridBand>
                                      </bands>
                                      <displaylayout allowcolsizingdefault="Free" allowcolumnmovingdefault="OnClient" allowdeletedefault="Yes" allowsortingdefault="OnClient" allowupdatedefault="Yes"
                                            headerclickactiondefault="SortMulti" name="UltraWebGrid1" rowheightdefault="22px" rowselectorsdefault="No" selecttyperowdefault="Single"
                                            stationarymarginsoutlookgroupby="True" version="4.00" AllowAddNewDefault="No"
                                            LoadOnDemand="Automatic" ColFootersVisibleDefault="No" RowSizingDefault="Free"
                                            FixedHeaderIndicatorDefault="Button" TableLayout="Fixed" UseFixedHeaders="True">
                                        <framestyle backcolor="#B5CFF7" bordercolor="#999999" borderstyle="None" borderwidth="3px" width="100%" Cursor="Default" />
                                    <RowAlternateStyleDefault BackColor="LightSlateGray">
                                        <BorderDetails ColorLeft="LightSlateGray" ColorTop="LightSlateGray" />
                                    </RowAlternateStyleDefault>
                                    <ClientSideEvents AfterCellUpdateHandler="uwgADSpread_AfterCellUpdateHandler" />
                                    <headerstyledefault backcolor="#8799AB" borderstyle="Solid" BorderColor="Black"
                                        ForeColor="White">
                                        <borderdetails colorleft="White" colortop="White" widthleft="1px"
                                            widthtop="1px" />
                                    </headerstyledefault>
                                    <rowstyledefault backcolor="White" bordercolor="Silver" borderstyle="Solid"
                                        borderwidth="1px" ForeColor="Black">
                                        <padding left="3px" />
                                        <borderdetails colorleft="White" colortop="White" />
                                    </rowstyledefault>
                                    <GroupByRowStyleDefault BackColor="#95B9F0" ForeColor="Black">
                                    </GroupByRowStyleDefault>
                                    <SelectedRowStyleDefault BackColor="#454B73" ForeColor="White">
                                    </SelectedRowStyleDefault>
                                    <GroupByBox Hidden="True">
                                        <BandLabelStyle BackColor="#6372D4" ForeColor="White">
                                        </BandLabelStyle>
                                        <BoxStyle BackColor="#B5CFF7">
                                        </BoxStyle>
                                    </GroupByBox>
                                    <AddNewBox Hidden="False" Prompt="" />
                                    <activationobject bordercolor="Black" borderwidth="" BorderStyle="Dotted">
                                    </activationobject>
                                    <filteroptionsdefault AllowRowFiltering="OnClient" FilterUIType="HeaderIcons">
                                        <filterdropdownstyle backcolor="White" bordercolor="Silver" borderstyle="Solid"
                                            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>
                                        <filteroperanddropdownstyle backcolor="White" bordercolor="Silver"
                                            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>
                                <asp:Button ID="btnUpdateRDSpreadChanges" runat="server" Text="Update Changes" OnClick="btnUpdateRDSpreadChanges_Click" OnClientClick="setChangeNo();" />
                                <asp:Button ID="btnCancelRDSpreadChanges" runat="server" Text="Cancel Changes" OnClick="btnCancelRDSpreadChanges_Click" OnClientClick="setChangeNo();" />
       <asp:SqlDataSource ID="RDSpreadDataSource" runat="server"
            ConnectionString="<%$ ConnectionStrings:FastTrackConnectionString %>"
            SelectCommand="getRDSpread" SelectCommandType="StoredProcedure">
                <SelectParameters>
                    <asp:SessionParameter Name="compid" SessionField="CompanyID" Type="Int32" />
                </SelectParameters>
        </asp:SqlDataSource>