title: How do I set intervals for values in DateTimeAxis
body: <p>How to set interval with 5 or 10 minutes value for example.
  When I am wrtiting </p>
  
  <pre><code>new OxyPlot.Axes.DateTimeAxis()
          {
              Position = AxisPosition.Bottom,
              IntervalType=DateTimeIntervalType.Minutes,
              IntervalLength=5
          };
  </code></pre>
  
  <p>It does not work.
  <img src="https://i.stack.imgur.com/58xNc.png" alt="enter image description here"></p>