What happens on resize (and how can I force it to happen without resizing)?

Hello everybody!
After running into this for the umpteenth time, I have decided to ask somebody who knows better. So, here goes:
Often, when I change something in the layout of an applet or an application (e.g. removing a JComponent and replacing it with another one), it doesn't get updated. I need to resize the Application window or the AppletViewer window, and then the change is correctly displayed and everything works fine. For Applets, I figured out that I can pack() as a workaround, but this can have some nasty side effects. I haven't been able to find anything for Applets though (an Applet doesn't have a pack() method).
So, does anyone know what exactly happens when I resize that window and why then my changes to the layout are applied? And, more importantly, what I have to do to reproduce this effect without resizing?
Thanks a lot in advance,
Wojtek

Thanks for the reply! Doesn't work though (invalidate-revalidate was one of my first tries...):
- Applet has no revalidate().
- If I put all my stuff into an extra JPanel that I add to the Applet, and revalidate() the JPanel after changing the stuff in it, nothing happens, I still need to resize.
Any other ideas?

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What happens on resize (and how can I force it to happen without resizing)?

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