GUI design - Help

i m developing an instant messsenger application for mobile phones.
I thought of creating a class for each UI and a Controller class to handle all the events.
But in netbeans 4.1 the entire code is contained in a Midlet
so i wanted to know wat cud be done??
1)everythng in jus 1 Midlet
or
2)create a class for each UI screens??
if option 2 is better then how can it be done in netbeans4.1??

Some suggestions:
In general: mouse-operation with big buttons (waiters are under stress !)
One JFrame containng:
1. Panel with scrolling JTable for the bill: Items, Price
     and big textfield at bottom of panel with sum to pay
2. Panel with different layers (CardLayout) : Customers, Items, Payment, ...
3. Back-Next button-pair to go from layer to layer.
Evidently, this list ist not meant to be complete.
Good luck !

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