title: How to show a plot in a tooltip with Shiny
body: <p>I'm building a Shiny app using ggvis, and I need to show a plot (a bar chart, for example) in a tooltip.</p>
  
  <p>So basically, when a user clicks one of the points in the main plot I want a tooltip (or something of the sort) to display a new plot with extra information.</p>
  
  <p>Is it possible to do this with Shiny?</p>