final MoveDragOperation mop = new MoveDragOperation
(Arrays.asList(carrier), ORIGIN_POINT, EmptySnapModel.INSTANCE, EmptySnapModel.INSTANCE);
mop.update(new Point2D.Double(0, StrictGeomUtility.toExternalValue(delta)), 1);
mop.finish();
}
final MassElementStyleUndoEntry massElementStyleUndoEntry = builder.finish();
getActiveContext().getUndo().addChange(ActionMessages.getString("AlignMiddleAction.UndoName"), massElementStyleUndoEntry);
}