Hi,

I'm trying to combine two tutorials to create a dynamic set of reactive elements but can't get it to work. I'd like to combine this tutorial https://gist.github.com/wch/5436415/ with the standard example of a histogram with a slider for the bins.

So one slider controls how many panels are created and in each panel there is a slider and a histogram and that slider controls the bins of the histogram.

This is the dynamic plot example:

```
shinyUI(pageWithSidebar(
headerPanel("Dynamic number of plots"),
sidebarPanel(
sliderInput("n", "Number of plots", value=1, min=1, max=5)
),
mainPanel(
uiOutput("plots") # This is the dynamic UI for the plots
)
))
```

```
max_plots <- 5
shinyServer(function(input, output) {
# Insert the right number of plot output objects into the web page
output$plots <- renderUI({
plot_output_list <- lapply(1:input$n, function(i) {
plotname <- paste("plot", i, sep="")
plotOutput(plotname, height = 280, width = 250)
})
# Convert the list to a tagList - this is necessary for the list of items
# to display properly.
do.call(tagList, plot_output_list)
})
# Call renderPlot for each one. Plots are only actually generated when they
# are visible on the web page.
for (i in 1:max_plots) {
# Need local so that each item gets its own number. Without it, the value
# of i in the renderPlot() will be the same across all instances, because
# of when the expression is evaluated.
local({
my_i <- i
plotname <- paste("plot", my_i, sep="")
output[[plotname]] <- renderPlot({
plot(1:my_i, 1:my_i, xlim = c(1, max_plots), ylim = c(1, max_plots), main = paste("1:", my_i, ". n is ", input$n, sep = ""))
})
})
}
})
```

and I'd like to combine it with something like this:

```
fluidRow(column(4,
sliderInput(inputId="bins",
"Number of bins:",
min = 1,
max = 50,
value = 30)),
column(8, renderPlot({
x <- faithful[, 2]
bins <- seq(min(x), max(x), length.out = input$bins + 1)
# draw the histogram with the specified number of bins
hist(x, breaks = bins, col = 'darkgray', border = 'white')
})))
```

But when I replace renderPlot with renderUI and insert the fluidRow nothing is rendered at all. Any help solving this would be greatly appreciated.

Thanks!