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I'm afraid it's not possible with default Form. If you want this functionality, use some more advanced UI library (or build your own).
For example thw LWUIT: [http://www.oracle.com/technetwork/java/javame/tech/lwuit-141954.html|http://www.oracle.com/technetwork/java/javame/tech/lwuit-141954.html] where you can enable/disable various components on screen and much more.