FindControl of GridFooterItem within ItemDataBound event handler within GridDataItem context

[Phil]

I have a master detail grid.  I am trying to modify the footer in the detail grid view, but the FindControl is returning nothing.

Protected Sub invoiceHeaderGrid_ItemDataBound(ByVal sender As Object, ByVal e As GridItemEventArgs)
    If TypeOf e.Item Is GridDataItem Then
        Dim _item As GridDataItem = e.Item
        If (_item.OwnerTableView.Name = "InvoiceDetails") Then
            Dim _ftrItem As GridFooterItem = _
                DirectCast(_item.OwnerTableView.GetItems(GridItemType.Footer)(0), GridFooterItem)
       End If
   End If
End Sub

[Princy]

Hello Phil,

You can try out the following code to access the FooterItem for the DetailTable of your grid:
cs:

     Protected Sub RadGrid1_ItemDataBound(ByVal sender As Object, ByVal e As GridItemEventArgs)
         If TypeOf e.Item Is GridFooterItem AndAlso e.Item.OwnerTableView.Name = "Detail1" Then
             Dim _ftrItem As GridFooterItem = DirectCast(e.Item, GridFooterItem)
         End If
     End Sub

Thanks
Princy.

[Phil]

I am currently doing what you suggest, but the GridDataItem context has the data that I need to place in the footer.  Some of the times that row in the GridDataItem does not exist. 
Is it that the footer does not exist yet?

[Princy]

Hello Phil,

If you are trying to access the footer item of your detail table and alter its data based on the data item of the detail table of the grid itself, then you can try out the following code:
cs:

     Protected Sub RadGrid1_PreRender(ByVal sender As Object, ByVal e As EventArgs)

         For Each _item As GridDataItem In RadGrid1.Items
             If _item.OwnerTableView.Name = "InvoiceDetails" Then
                 Dim _ftrItem As GridFooterItem = DirectCast(_item1.OwnerTableView.GetItems(GridItemType.Footer)(0), GridFooterItem)
             End If
         Next
     End Sub

-Princy.

[Phil]

I was wondering how I can teach myself these things?

[Princy]

Hello Phil,

Telerik has put together documents related to nearly every functionality. Put in some time to implement these and have a look at different scenarios, thats how i got the basics in place. Refer to the following document to understand how to access rows and cells in a grid:
Accessing cells and rows
 
Thanks
Princy.