title: JavaFX 8 SceneBuilder LineChart data type
body: <p>It seems like when I create a LineChart in SceneBuilder it defaults to "String". That is: <code>LineChart&lt;String, String&gt;</code>.</p>
  
  <p>When I load it in code then try to add some data I get:</p>
  
  <pre><code>Exception in thread "JavaFX Application Thread" java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.String
  </code></pre>
  
  <p>It works fine if I create the chart in code instead:</p>
  
  <pre><code>val chart = new LineChart[Number, Number]( new NumberAxis(), new NumberAxis())
  </code></pre>
  
  <p>I don't see any option in SceneBuilder that allows me to choose "Number" as the type of data the chart will have.</p>
  
  <p>What am I missing here?</p>