title: rCharts nvd3 lineWithFocusChart Customization
body: <p>I am working with nvd3 on rCharts and was wondering if there was a way to customize the axes for the lower view finder graph on a lineWithFocusChart.
  I have provided a reproducible example below, where I customize the x and y axes to have commas separating the thousands place, but that formatting does not show up on the lower view finder chart. How could this be solved? Thank you!</p>
  
  <pre><code>      library(rCharts)
        temp &lt;- data.frame(x = 1:2000, y = 1:2000, z = c(rep(1,1000), rep(0,1000)))
        g &lt;- nPlot(y ~ x, group = "z", data = temp, type = "lineWithFocusChart")
        g$templates$script &lt;- "http://timelyportfolio.github.io/rCharts_nvd3_templates/chartWithTitle_styled.html"
        g$set(title = "Example")  
        g$chart(transitionDuration = -1,
                tooltipContent = "#! function(key, x, y) {
                                  return 'z: ' + key + '&lt;br/&gt;' + 'x: ' + x + '&lt;br/&gt;' + 'y: ' + y 
                                }!#", 
                showLegend = FALSE, margin = list(left = 200, 
                                                  right = 100, 
                                                  bottom = 100,
                                                  top = 100))               
        g$xAxis(axisLabel = "x",
                tickFormat = "#!function(x) {return d3.format(',.0f')(x);}!#")
        g$yAxis(axisLabel = "y", 
                width = 100,
                tickFormat = "#!function(y) {return d3.format(',.0f')(y);}!#",
                showMaxMin = FALSE)
        g
  </code></pre>