Custom ui component with default layout

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Hello,
I am trying to develop custom swing components with default layout set.
Both component class and its BeanInfo are written with NetBeans 6.1
However, when trying to put this custom swing component into interface builder (matisse) of
NetBeans 6.1, the default layout is always replaced with GroupLayout.
Is there any way to correctly specify default layout manager used in a custom
swing component?

thanks a lot!