Try run here attached Test

- Select some node in JTree1 ( from JInternlFrame1 )
- move mouse over second JInternalFrame2
- mouse click inside JTree2 (on some node)

-> node isn't selected, JTree isn't focused now, you must click again to transfer focus to JTree2.

This Test case works fine with JDK 1.4.0 (fcs) but but not with :
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-beta-b08)
Java HotSpot(TM) Client VM (build 1.4.1-beta-b08, mixed mode)