using cusrtom classes in GWT designer

Hi,

I would like to use a custom class in GWT designer:

class Portal extends DockLayoutPanel

{

 public Portal

 {

  super (Unit.PX);

 }

 ...

}

When adding this to a SpltLayoutPanel in GWT designer the parser complains about a missing Portal (Unit) constructor. When I add this constructor, the parser keeps quiet.

Why can't I hide the super class / the decision which unit to use?

Thanks

Magnus

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