tabPanel("Demo data",
    value = "demoTab",
    tags$div(
        tags$div(
            style = "display:inline-block; vertical-align: middle;
      padding-right: 20px;",
            uiOutput("chooseDataset")
        ),
        tags$div(
            style = "display:inline-block; vertical-align: middle;",
            p(""),
            uiOutput("linktoDemoPdf")
        )
    ),
    actionButton("loadDemoDataset", "Load demo dataset",
        class = actionBtnClass
    ),
    p("Once the 'Load' button (above) clicked, you will be automatically
    redirected to Prostar home page. The dataset will be accessible within
    Prostar interface and processing menus will be enabled. However, all
    importing functions ('Open MSnset', 'Demo data' and 'Convert data')
    will be disabled
    (because successive dataset loading can make Prostar unstable). To work
    on another dataset, use first the 'Reload Prostar' functionality from
    the 'Dataset manager' menu: it will make Prostar restart with a fresh R
      session where import functions are enabled."),
    hr(),
    uiOutput("infoAboutDemoDataset")
)
