title: Change the title of the AmChart
body: <p>I am changing datesets of the charts when having certaint condition in if cause.
  So chart bars shows dataset by day or by month. I want to change the title of the chart when I repaint the chart. I can't add additional valueAxis later, because it's already there, but somehow title to different want. I want to do something like this <code>chart.valueAxis.title = "Title #2"</code>But it doesn't work. How to reach that variable in chart?</p>
  
  <p>Example:<a href="http://jsfiddle.net/u3ypB/516/" rel="nofollow">http://jsfiddle.net/u3ypB/516/</a></p>
  
  <p>Thanks!</p>