The Eclipse Forms Programming Guide is a tutorial about creating forms in Eclipse. One of its first example creates a text box that is supposed to have a 'flat' border. However, if you actually run the sample code, it does not work -- no border is drawn. After much gnashing of teeth, I determined that a line of code was missing from the example:
toolkit.paintBordersFor(form.getBody());
You must use this incantation to get field borders drawn.