Quesion about BasicToggleButtonUI's paint() method

hi,everybody,
I read the source code of BasicToggleButtonUI today and confused about it.
As what you see,a JToggleButton has two states.When you pressed the button,
the background color will changed.It remain the background unless you press the
button again.
However, I found that the paint() method and painticon() method are quite similar to
these of BasicButtonUI which is the super class of BasicToggleButtonUI.I could not found
the snippet to keep the background color. Can anybody who is mastered in this to tell me
why?
thx in advancd.

My question is, is there any way to ensure that a repaint() is completed before the program will move on?If you are not running multiple threads, then the answer is Yes...it already does. Chances are you are using the AWTEventQueue thread to do all of your work. When you click on a button, it creates an Event and puts it on the EventQueue. When repaint is called, an event is created and placed on the queue. Each event in the queue is processed by one thread, ONE AT A TIME, in the order that they were put into the queue.
If you have multi-threaded your application, you will have to learn more about how to handle multi-threading in GUI's. Typically synchronized(getTreeLock()) will help...sometimes.
If you don't know if you have multi-threaded or not....then you haven't done it.
Usually this type of issue is a coding error. If you post some code maybe someone else can spot the problem.

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