CellSelectionChanged and RowSelectionChanged both are not  working , when i debug on my local it fires at the break point  on the event  hoe ever the text am writing on to the text box does not  display on the page .. what is  happeneing ,  on the server it does not work as well.. what is that am missingn  reply asap.

<igtbl:WebDataGrid id="grid" runat="server" EnableDataViewState="true" OnColumnSorted="grid_ColumnSorted" 

AutoGenerateColumns="True" AutoPostBackFlags="true" EnableAjaxViewState="true" oncellselectionchanged="grid_CellSelectionChanged">
<Behaviors>
<igtbl:Selection Enabled="true" RowSelectType="Single" CellClickAction="Row" CellSelectType="Single">
<%--<AutoPostBackFlags RowSelectionChanged="true" />--%>
<AutoPostBackFlags CellSelectionChanged="true" />
</igtbl:Selection>
<igtbl:Sorting Enabled ="True" SortingMode ="Single">
</igtbl:Sorting>
</Behaviors> 

protected void grid_CellSelectionChanged(object sender, SelectedCellEventArgs e)

{
errormessage.Text = "In grid_CellSelectionChanged";

}