JFrame - how to auto resize widgets when window is resized?

I'm just experimenting with the GUI editor in NetBeans; really it's a fast to familiarise myself with the various Swing components, how they look and what they do. I have some experience of Qt, which uses spacers to ensure this happens. They also prevent the window from being resized to a size of 0:0.

When I resize my JFrame, the widgets disappear - what do I need to do to stop the widgets from disappearing and to ensure they are automatically resized to fit inside a window that is being resized? One trick I found was to set a minimum size for the window, but this doesn't resize the widgets.

Thanks

[627 byte] By [BobCrivensa] at [2007-11-27 5:38:11]