I have a grid with a GridTableView inside. I automatically expand all rows using HierarchyDefaultExpanded=true. But I'd like to hide the expander column. I've set ExpandCollapseColumn-Visible = false. But it has no effect.
I've tried your solution. It seems to remove the Expand cell for the parent row, but not the blank cell on the child row. As a result, the child row gets moved right across to the right. Picture attached.