property Schedule.HeaderDayHeight as Double
Indicates the height of the day's header.

TypeDescription
Double A double expression that indicates the height of the header to be shown the date's labels, in the schedule view. A positive value is multiplied with the font's height, while a negative value indicates a fixed height. 
By default, the HeaderDayHeight property is 1.5. The HeaderDayHeight property determines the height of the header by multiplying the value with the height of the current font, if the value is positive, else if the value is negative it indicates a fixed height. The Font property indicates the control's font. Use the HeaderDayHeight property to programmatically extend the header's height. The HeaderDayHeight property on 0, indicates that no header is shown for dates. The HeaderDayShortLabel property indicates the labels to be displayed on the date's header when the schedule vies is minimized so no time scale is shown, while the HeaderDayLongLabel property indicates the labels to be shown on date's header when the schedule view displays time scales.

The HeaderGroupHeight property indicates the height of the header that displays groups in the control.