spacer

Inserting Boxes in Netbeans designer

I'm trying to insert some spacers into a layout on JPanel. I've got 3 buttons and I'd like to put something similar to Box.createRigidArea(new Dimension(10, 0)) between them. Netbeans 6.9.1 doesn't seem to have an option to create them - is that true? Is there some workaround? ...