title: -[UIView setHostedGraph:] unrecognized selector sent to instance
body: <p>I am trying to use Core Plot to draw a graph, but I my graph view is instantiated as a <code>UIView</code> <em>even though I've set it as <code>CPTGraphHostingView</code> in interface builder</em>:</p>
  
  <p><img src="https://i.stack.imgur.com/oacEy.png" alt="enter image description here"></p>
  
  <p>Here is my code:</p>
  
  <pre><code>usersGraph = [[CPTXYGraph alloc] initWithFrame:usersGraphView.frame];
  usersGraphView.hostedGraph = usersGraph;
  </code></pre>
  
  <p>Why would that happen?</p>