title: Tooltip in shiny UI for help text
body: <p>I want to place a help text for check-box label as a tooltip.
  In the following example I use the <code>shinyBS</code> package - but I only get it to work for the title of the checkbox input group.</p>
  
  <p>Any ideas how it could work after the "Lernerfolg" or "Enthusiasmus" labels?</p>
  
  <pre><code>library(shiny)
  library(shinyBS)
   server &lt;- function(input, output) {
    output$distPlot &lt;- renderPlot({
      hist(rnorm(input$obs), col = 'darkgray', border = 'white')
  
    output$rendered &lt;-   renderUI({
      checkboxGroupInput("qualdim",  tags$span("Auswahl der Qualitätsdimension",   
        tipify(bsButton("pB2", "?", style = "inverse", size = "extra-small"),
               "Here, I can place some help")),
  
                         c("Lernerfolg"             = "Lernerfolg"   , 
                           "Enthusiasmus"           = "Enthusiasmus"          
                           ),
                         selected = c("Lernerfolg"))
  
  
    })
  
    })
  }
  
  ui &lt;- fluidPage(
    sidebarLayout(
      sidebarPanel(
        sliderInput("obs", "Number of observations:", min = 10, max = 500, value = 100),
        uiOutput("rendered")
      ),
      mainPanel(plotOutput("distPlot"))
    )
  )
  
  shinyApp(ui = ui, server = server)
  </code></pre>