title: Set GridLayout row height in Vaadin
body: <p>Very straight forward question, if you have a GridLayout defined in Vaadin, how can you set the height of all / individual rows? E.g:</p>
  
  <pre><code>mainLayout = new GridLayout(2, 7);
  mainLayout.setMargin(true);
  mainLayout.setWidth("100%");
  mainLayout.setHeight("100%");
  // Set row[s] height?
  </code></pre>
  
  <p>Thanks in advance!</p>