| Applies To: | Form | SubForm |
Description
If enabled, this event is generated when the user attempts to drag the thumb in a vertical scrollbar in a Form or SubForm. This event occurs only in a Form or SubForm whose HScroll property is set to ¯1 and is distinct from the Scroll event that is generated by a Scroll object.
The event message reported as the result of ⎕DQ, or supplied as the right argument to your callback function, is a 3-element vector as follows:
| [1] | Object | ref or character vector |
| [2] | Event | 'VThumbDrag' or 441 |
| [3] | Position | numeric |
The value of Position is the new (requested) position of the Thumb. Setting the action code of this event to ¯1, or returning a 0 from a callback function attached to it, has no effect.