Calendar.tooltip read/write property
Get or set the tooltip text that appears when the user moves the mouse over the Calendar, represented as a string value.
Set the property to an empty string to remove the tooltip message.
Example
local ui = require "ui"
-- create a simple Window
local win = ui.Window("Combobox.tooltip sample", "fixed",340, 180)
local label = ui.Label(win, "Select an date : ", 10, 20)
local cal = ui.Calendar(win, label.x+label.width+6)
cal.tooltip ="Choose a date"
win:show()
-- update user interface
repeat
ui.update()
until not win.visible