title: How to expand Antd table row by click a button
body: <p>Version
  3.0.3</p>
  <p>Environment
  pc, chrome</p>
  <p>Reproduction link
  <a href="https://codesandbox.io/s/my02ok19wy" rel="nofollow noreferrer">https://codesandbox.io/s/my02ok19wy</a></p>
  <p>Steps to reproduce
  now, Table can expand row by two ways:<br></p>
  <ol>
  <li>use icon in the first column</li>
  <li>click the whole row with expandRowByClick as true.</li>
  </ol>
  <p>But those are not what I want. I want to use the button in some other column, maybe the button <code>Show More</code>. Then, when I click <code>Show More</code>, the row will expand. How to realize this?</p>
  <p>Like the demo shows, I want to expand the row by click <code>Show More</code> instead of click the button in the first cell. Thanks</p>
  <p>What is expected?
  expand one row by click one button not in the first cell</p>
  <p>What is actually happening?
  Must click the button in the first cell of the row. The button can't move to other cell.</p>