title: Clearing a series and keep others in JFreeChart
body: <p>I'm using JFreeChart to create a chart that has 6 TimeSeries in it.<br>
  <strong>Problem</strong>: When I call <code>.clear()</code> on one of those series all others get hidden:  </p>
  
  <pre><code>    this.Series1.clear();
  </code></pre>
  
  <p><strong>Question</strong>: What should I do to clear a series without others disappear?  </p>
  
  <p>Before calling <code>.clear()</code> on the "Red" series.<br>
  <img src="https://i.stack.imgur.com/ciH5N.png" alt="enter image description here"></p>
  
  <p>After calling <code>.clear()</code> on the "Red" series.<br>
  <img src="https://i.stack.imgur.com/PIcxS.png" alt="enter image description here"></p>