diff --git a/src/BoardSwitcher.js b/src/BoardSwitcher.js
index 61ad96f..435bb48 100644
--- a/src/BoardSwitcher.js
+++ b/src/BoardSwitcher.js
@@ -15,10 +15,24 @@ class Board extends React.Component {
 }
 
 class BoardSwitcher extends React.Component {
+  constructor(props){
+    super(props);
+    this.state = {
+      toggle: 0,
+    };
+  }
+  
+  handleClick(event) {
+    this.setState({
+      toggle: (this.state.toggle+1)%3
+    });
+  }
+  
   render() {
     let boards = [];
+
     for (let ii = 0; ii < this.props.numBoards; ii++) {
-      let isSelected = ii === 0;
+      let isSelected = ii === this.state.toggle;
       boards.push(
         <Board index={ii} selected={isSelected} key={ii} />
       );
@@ -27,10 +41,11 @@ class BoardSwitcher extends React.Component {
     return (
       <div>
         <div className="boards">{boards}</div>
-        <button>Toggle</button>
+        <button onClick={ (e) => this.handleClick(e) }>Toggle</button>
       </div>
     );
   }
+
 }
 
 export default BoardSwitcher;