Refresh a JPanel every time.

Hi,
How can you refresh a JPanel every time you invoke this JPanel?
I have a Swing Application with a JSplitPane: a JTree on the left and a JPanel on the right. The JTree is used as a menu to display the right JPanel on the right. At this moment, the JPanels will only be created when I start the Application, so not on every time when I click on the JTree. Is it possible to get a new instance of the JPanel every time I reach it from the JTree (or at least get a trigger so that the latest information will be shown)?
I hope someone can help. Thanks!
Tongue78.
|JTree                | Place to show the JPanels |
| ShowJPanel1 |                                           |
| ShowJPanel2 |                                           |
| ShowJPanel3 |                                           |
|                        |                                           |
|                        |                                           |
--------------------------------------------------------------------

A problem usually becomes easier when you disregard technical specs for a moment and think about it from a functional standpoint. In this case it would be something like "when I click on a node in the tree, I want to display a specific panel", right?
For your right panel, check out the CardLayout. It allows you to put multiple panels in the same space, while only one is visible at a time.
For the JTree, check out the event listeners that are part of Swing. A MouseListener for example will allow you to listen for mouse clicks on a certain component, so the start would be to install a mouselistener in the JTree.
A google search for something like "java JTree node mouselistener" will probably get you further on this subject, for example to get sample code how to get the currently selected node.

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