title: Python3, How can the user change the plots he/she wants to see in bokeh?
body: <p>I want to display one histogram at a time and have the user click on the year he/she wants to see without refreshing the page. I have three different histograms of three different years and want to add a radiogroup to change the year. How could I implement that?</p>
  
  <p>I have tried a lot of different things and this is the most recent:</p>
  
  <pre><code>radio_group = RadioGroup(
      labels=["2016", "2017", "2018"], active=0)
  
  layout = layout([widgetbox(radio_group)], [plot2016, plot2017, plot2018])
  
  show(layout)
  </code></pre>
  
  <p>The result of the radio_group should go into the layout.</p>
  
  <p>I know I should probably use JavaScript callbacks somewhere but I have no idea how.</p>