## ui.R ##
dashboardPage(
  dashboardHeader(),
  ## Sidebar content
  dashboardSidebar(
    sidebarMenu(
      menuItem("buchungen", tabName = "buchungen", icon = icon("dashboard")),
      menuItem("konten", tabName = "Konten", icon = icon("th"))
    )
  ),
 dashboardBody(
    tabItems(
      # First tab content
      tabItem(tabName = "buchungen",
        buchungenUI("buchungen_tab")
      ),

      # Second tab content
      tabItem(tabName = "widgets",
        h2("Widgets tab content")
      )
    )
  )
)