no GroupLayout in NetBeans 7, what's wrong?

Something wrong, I can't choose GroupLayout in NetBeans 7, I'm using Java 1.开发者_如何学C6

java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03)

NetBeans IDE 7.0.1 (Build 201107282000)

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I think the "Free Design" is the Group Layout. Look at the source.