Here is how I accomplished it for what it is worth...

 Notice in "GetStructureFieldLayout" where I hide the label given a specifc layout.

Rod

 void theDataGrid_AssigningFieldLayoutToItem(object sender, AssigningFieldLayoutToItemEventArgs e)
        {
           
            if (((DataRowView)(e.Item)).Row["parent_id"].ToString().Length == 0)
            {
                if (theDataGrid.FieldLayouts.Exists("ParentLayout"))
                {
                    e.FieldLayout = theDataGrid.FieldLayouts["ParentLayout"];
                }
                else
                {
                    theDataGrid.FieldLayouts.Add(GetStructureFieldLayout("ParentLayout"));
                    e.FieldLayout = theDataGrid.FieldLayouts["ParentLayout"];

                    //If this item has a product_id value, then the record should not be editable.
                    //If the item does not have a product_id value, then AllowEdit on the
                    //model_id, part_id, and quantity cells.
                }
                               
            }
            else
            {
                if (theDataGrid.FieldLayouts.Exists("ChildLayout"))
                {
                    e.FieldLayout = theDataGrid.FieldLayouts["ChildLayout"];
                }
                else
                {
                    theDataGrid.FieldLayouts.Add(GetStructureFieldLayout("ChildLayout"));
                    e.FieldLayout = theDataGrid.FieldLayouts["ChildLayout"];

                    //If this item has a product_id value, then the record should not be editable.
                    //If the item does not have a product_id value, then AllowEdit on the
                    //model_id, part_id, and quantity cells.
                }
            }
        }       

private FieldLayout GetStructureFieldLayout(string keyName)
        {
            FieldLayout fl = new FieldLayout();

            fl.Key = keyName;
            if (keyName == "ChildLayout")
                fl.Settings.LabelLocation = LabelLocation.Hidden;

            Field fld = new Field();
            fld.Name = "model_id";
            fld.Settings.CellValuePresenterStyle = Application.Current.FindResource("leftBorderHyperlinkCell") as Style;           
            fld.Label = "Model ID";
            fld.Settings.CellMinWidth = 150.0;
            fld.Settings.AllowEdit = false;
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "part_id";           
            fld.Settings.CellValuePresenterStyle = Application.Current.FindResource("hyperlinkCell") as Style;           
            fld.Label = "Part ID";
            fld.Settings.CellMinWidth = 100.0;
            fld.Settings.AllowEdit = false;
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "serial_id";
            fld.Settings.CellValuePresenterStyle = Application.Current.FindResource("cellValuePresenter") as Style;
            fld.Label = "Serial ID";
            fld.Settings.CellMinWidth = 100.0;
            fld.Settings.AllowEdit = false;
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "product_id";
            fld.Settings.CellValuePresenterStyle = Application.Current.FindResource("hyperlinkCell") as Style;           
            fld.Label = "Product ID";
            fld.Settings.CellMinWidth = 100.0;
            fld.Settings.AllowEdit = false;
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "quantity";
            fld.Settings.CellValuePresenterStyle = Application.Current.FindResource("cellValuePresenter") as Style;
            fld.Label = "Quantity";
            fld.Settings.AllowEdit = false;
            fl.Fields.Add(fld);

            //The following four fields are needed to show the hierarchy in the grid.
            fld = new Field();
            fld.Name = "PRODUCT_STRUCTURE_NEST";
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "product_structure_id";
            fld.Visibility = Visibility.Hidden;
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "parent_id";
            fld.Visibility = Visibility.Hidden;
            fl.Fields.Add(fld);

            fld = new Field();
            fld.Name = "sequence";
            fld.Visibility = Visibility.Hidden;
            fl.Fields.Add(fld);           

            return fl;
        }

Sorry Stenfanie, can't help you out with that one. I was just trying to get rid of the labels. It wouldn't really be a tree if the rows were all at the same level. You only have two levels right?

Hi rodyager,

I applied the code you supplied above, but I figured out that just the labels are hidden for the children. Is it also possible to align the colums of parent and all children? Exactly like the first question of the thread?

Thanks,

Stefanie

brilliant, thanks for sharing.