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:


| Name | Value | Description | |||
| exAllDayEventNoScroll | 0 | The all-day event header supports no scroll. | |||
| exAllDayEventNoMin | 0 | The all-day event header displays events as many as possible. | |||
| exAllDayEventMin4 | 4 | The all-day event header displays at least 4 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Max flag | |||
| exAllDayEventMin8 | 8 | The all-day event header displays at least 8 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Max flag | |||
| exAllDayEventMin12 | 12 | The all-day event header displays at least 12 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Max flag | |||
| exAllDayEventNoMax | 16 | The all-day event header displays events as many as possible. | |||
| exAllDayEventMax4 | 64 | The all-day event header displays at most 4 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Min flag | |||
| exAllDayEventMax8 | 128 | The all-day event header displays at most 8 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Min flag | |||
| exAllDayEventMax12 | 192 | The all-day event header displays at most 12 events. This flag can be combined with exAllDayEventScroll, exAllDayEventWheelScroll or any Min flag | |||
| exAllDayEventScroll | 256 | The all-day event header supports scrolling. | |||
| exAllDayEventWheelScroll | 4352 | 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. | |||
| exAllDayEventMinHighNibble | 983040 | Reserved for storing the high bits of the minimum events in the all-day header. | |||
| exAllDayEventMaxHighNibble | 15728640 | Reserved for storing the high bits of the maximum events in the all-day header. |