Code works in VS2003 but not in VS2005

Hello:
I have an aspx page in Visual Studio 2003 with a datagrid on it. I have the next code for highlighting the grid row when the mouse is over and then when the user clicks on the row it takes a copule of parameters (IdArea, AreaName) and redirects the browser to another aspx page.
This code works very well in VS2003 but I recently migrated this project to VS2005 and it does not work anymore, I tried to make it work but it seems I can't do it. What is happening (I suppose) is that the DataGrid1_SelectedIndexChanged event is not firing when the user clicks on the datagrid row so I have a page postback but no redirection at all.

Does anyone has any idea why this code stopped working ??
I would appreciate any help in this matter.
Thank you

Temujin

    CODE:
    Private Sub DataGrid1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DataGrid1.SelectedIndexChanged
        DataGrid1.SelectedItem.Attributes.Item("onmouseover") = "this.style.cursor='hand'"
        DataGrid1.SelectedItem.Attributes.Remove("onmouseout")
        '--Redirect to WebForm2
        Dim url As String
        url = "WebForm2.aspx?IdArea=" + DataGrid1.SelectedItem.Cells(0).Text + "&AreaName=" + DataGrid1.SelectedItem.Cells(1).Text
        Response.Redirect(url)
    End Sub

    Private Sub DataGrid1_ItemCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemCreated
        If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Or e.Item.ItemType = ListItemType.SelectedItem Then
            e.Item.Attributes.Add("onmouseover", "this.style.backgroundColor='#D8E4F8';this.style.cursor='hand'")
            e.Item.Attributes.Add("onmouseout", "this.style.backgroundColor='white';")
            e.Item.Attributes.Add("onclick", "javascript:__doPostBack('" & "DataGrid1:" & "_ctl" & (e.Item.ItemIndex + 3) & ":_ctl0','')")
        End If
    End Sub