shinyapps - Shiny - connecting sidebarPanels using conditionalPanel -

i trying create shiny dashboard - need select check boxes (in sidebarpanel - 'datasets') based on input value sidebarpanel ('treatment'). example, if @ image below: when user selects 'anti tnf-alpha' sidebarpanel, want first 2 checkboxes in 'datasets' panel on/selected. and, when 'dmards' selected, want last 2 options in 'datasets' on. tried conditionalpanel didn't work me. me rough code stuff?

thanks in advance!

dashboard

add server file:

observe({   selected <- input$yourselectinput    if (selected=="whatever wanted") {      updatecheckboxgroupinput(session,                              input$datasets,                              selected=c("the ones wanted selected"))    } else if (selected=="something else") {      updatecheckboxgroupinput(session,                              input$datasets,                              selected=c("different ones wanted selected"))    }  })