Get help with JComboBox, itemStateChange

hi, i get quite complex a problem.
i have a list containing 2 types of list. one list is the car model and the other is the car type.
so in one combo box, there will be a list of car model. when one car is selected in this, the other combo box will automatically update all the available car type (e.g. car model is BMW and car type is 318).
i dont know how to keep the second combo box updated immediately after item of the first combo box changes state.
some one help me pls

hi,
thanks for replying but my problem seems too hard for me.
i just got another problem.
i still have the file with a number of JFrames inside and the first, or considered to be the "main" JFrame. Now, when i click a button, a second JFrame after that will pop up but I dont know how to setVisible(false) for the main window using Netbeans. could you please help me do that?
thanks alot

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The best way to get help with logic

I was posting in a thread on support for logic which appears to have been deleted. anyway, what I was going to say I think is useful info for people, so I'm going to post it anyway. to the mods - it doesn't contain any speculation about policies or anything like that. just an explanation of my views on the best way to deal with issues people have with logic, which I think is a valuable contribution to this forum.
I think there's a need for perspective. when you buy an apple product you get 90 days of free phone support to get everything working nice and neat. you can call them whenever, and you could actually keep them on the phone all day if you wanted, making them explain to you how to copy a file, install microsoft office, or any number of little questions no matter how simple - what is that red button thingy in my window for?.. on top of that, you've got a 14 day dead on arrival period (or 10 days I can't remember) in which if your machine has any kind of hardware fault whatsoever it's exchanged for a totally new one, no questions asked. a lot of people complain that applecare is overpriced.. and if you think of it just as an extended warranty, then it is a little pricey. but if you are someone that could use a lot of phone support, then it's actually potentially a total bargain. the fact that 2 or more years after you bought a computer, you could still be calling them every single day, asking for any kind of advice on how to use anything on the machine, is quite something. many people on this forum have had problems when they made the mistake of upgrading to 10.4.9 without first creating a system clone or checking first with their 3rd party plug in vendors to make sure it was ok. so, with apple care, you could call them and keep a technician on the phone _all day_ talking you through step-by-step how to back up all of your user data, how to go through and preserve your preferences and any other specific settings you might not want to lose, and then how to rollback to an earlier OS version.. they'll hold your hand through the whole thing if you need them to.
as for applecare support for pro apps like logic, I'd be the first person to agree that it's not great for anyone except beginners and first time users. if you look at what it takes to get even the highest level of logic certification, it's all pretty basic stuff. and logic doesn't exist in a vacuum, there is an entire universe of 3rd party software and hardware, as well as studio culture and advanced user techniques that are going to be totally invisible to some poor phone support guy at apple that did a logic 101. but it's not hard to see that apple are trying to promote a different kind of support culture, it's up to you to decide whether you want to buy into it or not.
the idea is that they are able to provide basic setup support for new users, including troubleshooting. because it's a simpler level of support, at least they can do this well. so there's no reason why any new user with say a new imac and logic can't get up and running with the 90 days of phone support they get for free.
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Get help with JComboBox, itemStateChange

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