Events effecting panels in multiple tabs

I'm currently working on an application that has three tabs inside a JTabbedPane. Inside each pane is several panels ( probably a minimum of 5 panels to a pane, for layout resons ). I'm starting to code in the event handling for all of the buttons, and I have a few problems.
One: All of the panels are in seperate class and source files. For example, the west panel for a border layout is in WestPanel.class, and all the panels that are inside WestPanel have their own class files. Should I move all of the panels into one source file and have them as private inner classes to make event handling easier?
Two: How do I setup an event handler so that events in one panel affect objects in another panel? Say, pressing a button in WestPanel affects something in EastPanel? Or would this be fixed by having all the panels setup in one source file?
Three: This is sort of like #2, but this is for the seperate tabbed panes. The first pane is a setup pane. For instance, in the first panel, there is a JSlider to set the time. After the user has finished setting up the rest of the application, they press finish. When they press finish, it creates an object that keeps track of everything ( like the time ). How do I setup an event handler so that when they press finish, it takes all the values, creates the object, then uses the values in that object to set the values in the other panes?
Alrighty, I think that's everything. Any help is VERY much appreciated. Thank ye.

One is personal preference and good judgement. Either way will work,
and we can't really be helpful beyond general advice since we're not
familiar with your codebase. If the functionality of JPanel isn't extended,
they may fare better as inner classes, unless they're very large, etc..
For Two and Three, I suggest looking up the Mediator design pattern.

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