title: How to fill table/grid manually
body: <p>I am using Vaadin 8 and I want to make some sort of confusion matrix. I was wondering if I can fill the values of the table/grid manually according to the cell position, instead of data provider.</p>
  <pre><code>referenceTable.addColumn(reference -&gt; String.valueOf(reference.getId())).setId(REFERENCE_ID).setCaption(REFERENCE_ID).setMinimumWidth(100).setMaximumWidth(200);
  referenceTable.addColumn(reference -&gt; String.valueOf(reference.getTitle())).setId(TITLE_COLUMN).setCaption(TITLE_COLUMN).setMinimumWidth(100).setMaximumWidth(500);
  </code></pre>
  <p>I don't have any specific model which I can use.</p>
  <p>Something like this, I want
  <a href="https://i.stack.imgur.com/OIjqu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OIjqu.png" alt="enter image description here" /></a></p>