title: Horizontal button group inside anchor layout
body: <p>There is a panel with anchor layout used for vertical sizing.<br>
  Inside the panel there is a horizontal buttongroup.<br>
  Is there a way to set fixed width or better make the width depend on buttons?</p>
  
  <p>In my case it is always stretched to the size of the window.<br>
  There is the same problem with the grid inside the panel.<br>
  Thank you.</p>