I need to distinguish between the user clicking in an open area of the chart (available days on the calendar) versus clicking on a bar?
Please check the Chart.DateFromPoint and Chart.BarFromPoint property. The DateFromPoint property determines the date from point. The BarFromPoint property determines the key of the bar from the point. Use the Items.ItemBar property to access the bar inside the item. The ItemFromPoint property retrieves the handle of the item from the point.