protected void addToBottomBox(Component comp){
  bottomBox.add(Box.createHorizontalStrut(bottomStrutWidth),bottomBoxIndex);
  ++bottomBoxIndex;
  bottomBox.add(comp,bottomBoxIndex);
  ++bottomBoxIndex;
}

protected void addToBottomBox ( Component comp ) { bottomBox . add ( Box . createHorizontalStrut ( bottomStrutWidth ) , bottomBoxIndex ) ; ++ bottomBoxIndex ; bottomBox . add ( comp , bottomBoxIndex ) ; ++ bottomBoxIndex ; }
add a component to the bottom box . takes care of organising glue , struts etc
