Here is the problem - i need all columns to line up but headers to appear only on the top of the tree - kinda faking a grid appearance. To do that I set columnSet.LabelPosition = NodeLayoutLabelPosition.None; for all top level nodes except the very first one that still displays the top header. I also set PreferredLabelSize and PreferredCellSize on the first column for all top level nodes but as you can see in the picture bellow first column is auto-resized to the text and my columns don't line up.

How do I disable this auto-resize of a column for the first node that shows headers ("2nds")?

Thanks