Tooltips are displayed for items and for the column headers in the timetable view. Tooltips are only displayed if Calendar.ShowToolTips is set to true. The item tooltip is formatted according to Calendar.ItemTooltipFormat. Item tooltips can be additionally customized by listening to the itemTooltipDisplaying event. The column header tooltip displays the text contents of the column header and can be customized by listening to the tooltipDisplaying event.