title: adding ButtonGroup to Box-layout object
body: <p>When I try to put <code>ButtonGroup</code> object to my <code>Box</code> object, compiler returns the following error:</p>
  
  <blockquote>
    <p>no method for such a type</p>
  </blockquote>
  
  <p>Please help me, how can I add my <code>ButtonGroup</code> into Horizontal Box?</p>