I'm not switching to the next diaplayable

Hi

I'm preety new to J2me.
I'm using NetBeans 6.0 RC1.
I have a Login screen with a user name and password and a TextBox.
Now, when the user enters the user name and password and clicks "Submit" -
in the CommandAction method in the "Submit" command I call the
ValidateUser() that sends the requset and get a response and then sets the
result in the textbox  and display the textbox - switch to another display.
The only problem that I don't understand is why I don't get to the textbox
or any displayalbe for that matter?
I read that I shouldn't do heavy processing in the CommandAction and use a
different thread for that.
I tryed to use it and it doesn't switch to the textbox display.
What should I do?
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