title: Observation data is not shown in the shiny application
body: <p>I'm building a simple application in shiny to look at data divided to quadrants.</p>
  
  <p>this is the server file:</p>
  
  <pre><code>shinyServer(function(input, output){
    output$chart1 = renderChart({
    library(rCharts)
    data = data.frame(z = c("a","b","c","d","e","f","g","h","i","j"),y = sample(100,10),x = sample(100,10))  
    d1 = dPlot(
      y ~ x,
      groups = c("z"),
      data =data,
      type = "bubble"
    )
    d1$xAxis(type="addMeasureAxis",overrideMin = 0, overrideMax = 100)
    d1$yAxis(type="addMeasureAxis",overrideMin = 0, overrideMax = 100)
    medY = median(data$y)
    medX = median(data$x)
  
    d1$setTemplate(
      afterScript = sprintf(
        paste(
          '
          &lt;script&gt;
          var line = d3.svg.line()
          .x(function(d) { return myChart.axes[0]._draw.scale()(d.x); })
          .y(function(d) { return myChart.axes[1]._draw.scale()(d.y); });
  
          d3.select("#%s svg g")
          .append("path")
          .datum([{x:',medX,',y:0},{x:',medX,',y:100}])
          .attr("d",line)
          .style("stroke","red")
          .style("stroke-width",1)
          &lt;/script&gt;
          '
        ,sep = "")
      ,d1$params$dom
    ))
  
    d1$layer(
      y ~ x
      ,groups = c("x","y")
      ,data = data.frame(x = c(0,100), y = rep(medX,2))
      ,type="line"
      ,color='red'
    )
  
    d1$set(dom = 'chart1')
    return(d1)
  })
  </code></pre>
  
  <p>})</p>
  
  <p>and here is the ui:</p>
  
  <pre><code>shinyUI(pageWithSidebar(
    headerPanel("Test"),
    sidebarPanel(),
    mainPanel(showOutput("chart1", lib = "dimple"))
  )) 
  </code></pre>
  
  <p>I get a chart but when I hover above the data points in the chart there is no description inside the boxes.</p>
  
  <p>When I run the same code without the shiny application and look at the output at the viewer on RStudio i see the description.</p>
  
  <p>I also added a vertical line which is not seen in the shiny application.</p>
  
  <p>Anyone knows how to overcome this problem?</p>
  
  <p>Thanks.</p>