Button Alignment in a TreeView

Question

How can I right-alline Buttons in a TreeView.
I have this:
http://i44.tinypic.com/2reilhz.jpg
but want this:
http://i44.tinypic.com/33xc1ua.jpg
I am trying to achieve this with a special TreeCell implementation and using a HBox as the container for the Button
and overwriting the updateItem:
            protected void updateItem(CassetteItem item, boolean empty) {
                super.updateItem(item, empty);
                if (empty) {
                    setText(null);
                    setGraphic(null);
                } else {
                    setText(item.toString());
                    setGraphic(hBox);
(I am using the latest JavaFX 2 bundled with JDK7.)

Answer 1

It works when using an AnchorPane instead of HBox:
AnchorPane anchorPane = new AnchorPane();
anchorPane.getChildren().addAll(itemName, button);
AnchorPane.setRightAnchor(button, 10.0);