constants AllDayEventScrollEnum
The AllowAllDayEventScroll property gets or sets a value that specifies whether the all-day event header supports scrolling. Use the ShowAllDayHeader property to show the schedule's All-Day header so all All-Day evens are shown on this header. The AllowCreateAllDayEvent property has effect only when the schedule displays no time scale. 

The AllowAllDayEventScroll property controls the number of rows that the all-day events header can display. The number of rows is determined using specific nibbles (4-bit groups) in its hexadecimal value:

For instance:

The AllDayEventScrollEnum type supports the following flags:

NameValueDescription
exAllDayEventNoScroll0 The all-day event header supports no scroll.
exAllDayEventNoMin0 The all-day event header displays events as many as possible.
exAllDayEventMin44 The all-day event header displays at least 4 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Max flag
exAllDayEventMin88 The all-day event header displays at least 8 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Max flag
exAllDayEventMin1212 The all-day event header displays at least 12 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Max flag
exAllDayEventNoMax16 The all-day event header displays events as many as possible.
exAllDayEventMax464 The all-day event header displays at most 4 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Min flag
exAllDayEventMax8128 The all-day event header displays at most 8 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Min flag
exAllDayEventMax12192 The all-day event header displays at most 12 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Min flag
exAllDayEventScroll256 The all-day event header supports scrolling.
exAllDayEventWheelScroll4352 The user can scroll the all-day event header by rotating the mouse wheel, while the cursor hovers the header. Remove this flag to disable scrolling using the mouse wheel.
exAllDayEventMinHighNibble983040 Reserved for storing the high bits of the minimum events in the all-day header.
exAllDayEventMaxHighNibble15728640 Reserved for storing the high bits of the maximum events in the all-day header.