Add application to JSplitPane

I want to create a menuapplication with a JSplitPane containing:

1) JTree on the left

2) JScrollPane with a JPanel (cardlayout) on the right

The intention is to open other javaapplications on the rightpanel depending the option choosen in the JTree...

When I click an option in JTree i'm able to show a JLable on the right.

But I am not able to show an javaapp (extends JFrame) on the right.

The javaapp is lauched but the menuapp receives following error:

java.lang.IllegalArgumentException: adding a window to a container

at java.awt.Container.addImpl(Container.java:652)

at java.awt.Container.add(Container.java:343)

at application.AppFrame.valueChanged(AppFrame.java:321)

at javax.swing.JTree.fireValueChanged(JTree.java:2424)

any suggestions?

[828 byte] By [pgoovaertsa] at [2007-11-27 1:26:54]