[C#]
public class SelectiveShowCheckBoxesColumn : HierarchyColumn
{

  public SelectiveShowCheckBoxesColumn () : base()  
  {
  }
  public SelectiveShowCheckBoxesColumn (string name) : base(name)
  {
  }
  public SelectiveShowCheckBoxesColumn (string name, string fieldName) : base(name, fieldName)
  {
  }
  
  protected override bool ShouldPaintCheckBox(NodeBase node)
  {
    return base.ShouldPaintCheckBox(node) && IsNodeWithCheckbox(node);
  }
  
  private bool IsNodeWithCheckbox(NodeBase node)
  {
    //hide checkboxes on the root nodes
    return node.Depth > 0;
  }
}