Adding child rows to a hierarchical grid.

I'm following the example from   https://www.telerik.com/forums/object-bound-hierarchy#711007, which describes how to create an object-based hierarchy. An excellent example.

I'm now trying to modify that example to look how I want, and I've done everything apart from the critical bit - adding the row of 'child' data.

For a normal row, I would do:

 Dim gvdi As New GridViewDataRowInfo(myGrid.MasterView)
        With gvdi
            .Cells("name").Value = t.name
            .Cells("status").Value = t.status
            .Tag = t '...plus any other columns I need

        End With

The example uses the simpler constructor for a new child row, like:

                childTemplate.Rows.Add(t.id, tt.name, tt.status) '....where 't' is my object.

This also works fine

But now I'd like to use the first style of constructor for the child row, and I can't work out how to do it.

When I use the first bit of code, the runtime complains that it's not a GridViewHierarchyRowInfo, so I changed it to be:

 Dim gvdi As New GridViewHierarchyRowInfo(myGrid.MasterView)
               'With gvdi
                   .Cells("name").Value = tt.name
                   .Cells("status").Value = tt.status
                   .Tag = tt
               End With

...and that doesn't work either. Is it the GridViewHierarchyRowInfo(myGrid.MasterView) which is wrong?

Any ideas?

Thanks