I have created a page with a WebImageButton within a WebDataGrid.  When the button is pushed, it does a full page postback instead of just the grid.  I add the OnItemCommand="grdClasses_ItemCommand" code to my markup and it causes the page to abend.  What am I doing wrong?  I will attach some of my code behind and the grid markup.  Thanks.

Code Behind...

Dim adapter As New SqlClient.SqlDataAdapter(sql.ToString, cn)

Dim ds As DataSet = New DataSet("Classes")

adapter.Fill(ds)

If ds.Tables(0).Rows.Count > 0 Then

With grdClasses

.DataSource = ds

""

.DataBind()

End With

End If

Mark Up...

<ig:WebDataGrid ID="grdClasses" runat="server" AutoGenerateColumns="False"

EnableDataViewState="True" Height="350px" Width="769px" OnItemCommand="grdClasses_ItemCommand">

<Columns>

<ig:BoundDataField DataFieldName="id" Hidden="True" Key="id">

<Header Text="BoundColumn_0" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="classdate" Key="classdate">

<Header Text="Class Date" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="cost" Key="cost" DataFormatString="{0:C}">

<Header Text="Cost" />

</ig:BoundDataField>

<ig:TemplateDataField Key="register">

<ItemTemplate>

<igtxt:WebImageButton ID="cmdClass" runat="server" Text="Register">

</igtxt:WebImageButton>

</ItemTemplate>

<Header Text="Register" />

</ig:TemplateDataField>

</Columns>

</ig:WebDataGrid>