In a ScrollPane, the scrollbar should be controlled by mouse or keyboard.
(HOME/END for horizontal, PAGE UP/DOWN for vertical). But sometimes
we can not control the scroll through those keys.

For Solaris:
When there is no component is "focused" (this mean no component is
displayed using a thick border),the scrollbar can not be controlled
by keyboard.
For Win95/98/NT:
The scrollbar can not be controlled at all. (Even some component is
"focused")

$ java -version
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-B)
Java(TM) HotSpot Client VM (build 1.3beta-B-release, 1.3beta-B-release, interpreted mode)
$ uname -a
SunOS lizard 5.7 Generic sun4u sparc SUNW,Ultra-1

To reproduce this bug:
1. Compile and run the attatched file.
2. For win95/98/NT, you can find you can use mouse to control the scroll bar,
But you can not control it through keyboard.
3. For Solaris, you can control scroll bar by HOME/END key now.
Then enlarge the window, (be sure to keep the horizontal still can work)
Now, you will find:
1) No component is focused.
2) you can drag the horizontal scroll bar through mouse.
but the HOME/END key don't work any more.