title: FLEX: how can I set bottom-left coordinate of my component instead of the top-left
body: <p>I've some components with dynamic heights. They have to be aligned with respect to the bottom of my canvas container, so I cannot set the same y for all components.</p>
  
  <p>I could compute their heights and successively set the y but I was wondering if there was an easier way to do it.</p>
  
  <p>thanks</p>