diff --git a/src/grid/grid-cell.js b/src/grid/grid-cell.js
index <HASH>..<HASH> 100644
--- a/src/grid/grid-cell.js
+++ b/src/grid/grid-cell.js
@@ -1,9 +1,15 @@
 import React from 'react';
 
-export default function Cell(props) {
-  return (
-    <span>
-      {props.active ? 'cell!' : 'cell'}
-    </span>
-  );
+export default class Cell extends React.Component {
+  constructor(props) {
+    super(props);
+  }
+
+  render() {
+    return (
+      <span>
+        {this.props.active ? 'cell!' : 'cell'}
+      </span>
+    );
+  }
 }
Convert Cell into a class component

It needs to focus itself when it becomes active.