GoogleVis scatter plot with Shiny

shiny
6

Thanks for the help, I'm obviously not being clear enough.
Currently when I hover over a point it just displays the name of the y variable I'm feeding in as well as the x,y co-ordinates. What I would like is for it to display another column (called 'name') from the data frame when I hover over a point on the graph. I've tried this now but get an error:

graph_data <- reactive({epl_in[, c(input$xvar, input$yvar, foo.blah.tooltip <- epl_in$name)]})


output$plot <- renderGvis({
    gvisScatterChart(graph_data(),
                     options=list(legend = "none",
                                  title = paste('Scatter plot of ',input$xvar, ' by ',input$yvar),
                                  vAxis = paste("{title: '", input$yvar, "'}"),
                                  hAxis = paste("{title: '", input$xvar, "'}"),
                                  width = 800,
                                  height = 600))
})