I have a grid that binds on !IsPostBack in Page_Load, the grid has a GridClientDeleteColumn column with AutoGenerateColumns="true".  Everything works great until I start binding the grid on ClientSide, then I lose the GridClientDeleteColumn icon and functionality for the grid (only the new row do not have the GridClientDeleteColumn icon), however if I do a post-back on the page then any client side binding after will have the GridClientDeleteColumn.

The reason I am binding at Page_Load is so I get all the column names from my data object.  After the initial first bind (on server side), I am binding from the client side for speed so I don't have to do a full post back after I add/delete/modify my grid data rows.

Code:
ASPX code
-----------------------------------------------------------------------------------------------------------
<script language="javascript">
function AddProduct(productID){
          var myGrid = $find("<%=myGrid.ClientID%>");
          PageMethods.AddProduct(productID, OnSucceeded,OnFailed);
          myGrid.MasterTableView.rebind();        
}

function OnSucceeded(result, userContext, methodName) {
...
}

function OnFailed(error, userContext, methodName) {
...
}

</script>

<telerik:RadGrid ID="myGrid" runat="server" AllowAutomaticUpdates="True"
                                            AllowFilteringByColumn="False" AllowPaging="False" AllowSorting="True"
                                            AutoGenerateColumns="True" EnableEmbeddedSkins="false" EnableViewState="False"
                                            FilterItemStyle-HorizontalAlign="Left" GridLines="None"
                                            GroupHeaderItemStyle-HorizontalAlign="Left"
                                            PageSize="25" ShowFooter="True" EnableClientKeyValues="true"
                                            ShowGroupPanel="false" ShowStatusBar="True" Skin="Sunset">
                                    <clientsettings allowcolumnsreorder="False" allowdragtogroup="False"
                                            reordercolumnsonclient="False">
                                        <clientevents OnRowDeleting="RowDeleting"></clientevents>
                                        <selecting allowrowselect="false" />
                                        <DataBinding Location="MyPage.aspx"
                                            SelectMethod="GetData" SortParameterType="String" EnableCaching="false"
                                            DataPropertyName="Data" CountPropertyName="Count" />
                                    </clientsettings>                           
                                    <mastertableview clientdatakeynames="ProductID"
                                            datakeynames="ProductID" name="MasterTableView">
                                        <columns>                                    
                                            <telerik:GridClientDeleteColumn ConfirmText="Delete this item?" ButtonType="ImageButton"
                                                ImageUrl="delete.gif" CommandName="Delete" Text="Delete">
                                            </telerik:GridClientDeleteColumn>                                                                                    
                                            <telerik:GridBoundColumn UniqueName="ProductID" DataField="ProductID" HeaderText="ProductID">
                                            </telerik:GridBoundColumn>
                                            <telerik:GridBoundColumn UniqueName="ProductName" DataField="ProductName" HeaderText="Product Name">
                                            </telerik:GridBoundColumn>                                            
                                        </columns>
                                    </mastertableview>
 </telerik:RadGrid> 

Add Test Product: <input type="button" id="btnClientButton" onclick="AddProduct(12345)">

<asp:Button id="btnServerButton" OnClick="btnServerButton_Click" runat="server" Text="Do a Post Back Then Everything is A-OK">
-----------------------------------------------------------------------------------------------------------
Server Side Code:
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                        myGrid.DataSource=GetData("")["Data"];
                        myGrid.DataBind();
            }
        }

        [WebMethod(true)]
        public static Dictionary<string,object> GetData(string sortExpression)
       {
                  .
                  .
                  data.add("Data",objDataList);
                  data.add("Count",objDataList.Count);
                  return data;
       }

        [WebMethod(true)]
        public static bool AddProduct(int productID)
        {
                  .
                  .
                  objDataList.Add(productID)        

                  return true;
        }

Why is it that only when there's a post back (at least one post back) then the GridClientDeleteColumn will show when I do a client databind/rebind?