How to I get (FindControl) the button of a GridAttachmentColumn in a RadGrid

Question

I've got a RadGrid with a GridAttachmentColumn named "FileName". I'm trying to get (FindControl) the control out of the GridDataItem in the ItemCreated event. Specifically, I want the button control (or linkButton in this case). item.FindControl("FileName") always returns Nothing.

    Protected Sub AttachmentsRadGrid_ItemCreated(sender As Object, e As GridItemEventArgs)
        If TypeOf e.Item Is GridDataItem Then
            Dim item As GridDataItem = TryCast(e.Item, GridDataItem)
            If item IsNot Nothing Then
                Dim FileName = item.FindControl("FileName") 'Always Nothing
                If FileName IsNot Nothing Then
                    'Do something with it
                End If
            End If
        End If
    End Sub

Answer 1

Dim button As LinkButton = TryCast(item("FileName").Controls(0), LinkButton)

OR

Dim FileName = item.FindControl("gac_FileName")

The first line of code might be Telerik's preference so I put that line first. Notice that the AttachmentColumn in read mode is basically just a linkbutton.

Notice in the 2nd example that "gac_" in item.FindControl("gac_FileName") is added to the front of the UniqueName of the column. I noticed it in Chrome DevTools when I inspected the element from the browser. I should note that "FileName" is the UniqueName of the column in case you didn't want to read through the code above.