diff --git a/htdocs/samples/custom_x_scale.html b/htdocs/samples/custom_x_scale.html
index 1b8c7c0..6c8aecc 100644
--- a/htdocs/samples/custom_x_scale.html
+++ b/htdocs/samples/custom_x_scale.html
@@ -14,12 +14,28 @@
           x : 'x',
           columns: [
             ['x', 100, 120, 130, 200, 240, 500],
-            ['sample', 30, 200, 100, 400, 150, 250]
+            ['data1', 30, 200, 100, 400, 150, 250],
+            ['data2', 130, 100, 300, 200, 250, 350],
           ],
+          selection: {
+            enabled: true
+          },
           onenter: function (d) { console.log("onenter", d); },
           onleave: function (d) { console.log("onleave", d); }
         },
       });
+
+      setTimeout(function () {
+        chart.load({
+          columns: [
+            ['data1', 100, 210, 150, 200, 100, 150],
+          ]
+        });
+      }, 1000);
+
+      setTimeout(function () {
+        chart.x([200, 210, 350, 400, 550, 750]);
+      }, 2000);
     </script>
   </body>
 </html>
diff --git a/htdocs/samples/custom_xs_scale.html b/htdocs/samples/custom_xs_scale.html
new file mode 100644
index 0000000..1f30fc8
--- /dev/null
+++ b/htdocs/samples/custom_xs_scale.html
@@ -0,0 +1,49 @@
+<html>
+  <head>
+    <link rel="stylesheet" type="text/css" href="/css/c3.css">
+  </head>
+  <body>
+    <div id="chart"></div>
+
+    <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
+    <script src="/js/c3.js"></script>
+    <script>
+      var chart = c3.generate({
+        bindto: '#chart',
+        data: {
+          xs : {
+            'data1': 'x1',
+            'data2': 'x2',
+          },
+          columns: [
+            ['x1', 100, 120, 130, 200, 240, 500],
+            ['x2', 150, 220, 230, 400, 540, 600, 800],
+            ['data1', 30, 200, 100, 400, 150, 250],
+            ['data2', 130, 100, 300, 200, 250, 350, 100],
+          ],
+          selection: {
+            enabled: true
+          },
+          onenter: function (d) { console.log("onenter", d); },
+          onleave: function (d) { console.log("onleave", d); }
+        },
+      });
+
+      setTimeout(function () {
+        chart.load({
+          columns: [
+            ['data1', 100, 210, 150, 200, 100, 150],
+            ['data2', 200, 310, 50, 400, 120, 250, 10],
+          ]
+        });
+      }, 1000);
+
+      setTimeout(function () {
+        chart.xs({
+//          'data1': [200, 210, 350, 400, 550, 750]
+          'data2': [200, 210, 350, 400, 550, 750, 900]
+        });
+      }, 2000);
+    </script>
+  </body>
+</html>
