title: Kivy BoxLayout align widgets to the top border
body: <p>I'm using the following Kivy code to create BoxLayout with buttons:</p>
  
  <pre><code>BoxLayout:
      orientation: "vertical"
      width: 200
      size_hint_x: None
  
      Button:
          size_hint_y: None
          height: 30
          text: 'btn1'
  
      Button:
          size_hint_y: None
          height: 30
          text: 'btn2'
  
      Button:
          size_hint_y: None
          height: 30
          text: 'btn3'
  </code></pre>
  
  <p>But buttons stick to the bottom edge, how can i push them towards the top edge of the layout?</p>
  
  <p><img src="https://i.stack.imgur.com/VEsYK.png" alt="enter image description here"></p>