There are actually many ways to what you want:

1) use fragments.  to be used during the construction of the containing
component
2) utilize isVisible()

  add( new Label( "myLabel" ) {
       public boolean isVisible() {
              return (if equal to my condition);
       }
    } );

   This way dynamically adjusts the display without having to recreate the
containing component.  The drawback is that it is always added to the
component hierarchy (but is that a drawback ;-)

I am sure there are other ways but these I have used to date.

- Doug

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