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Object Types: Trees and splitters.

Description:
Tree Controls—Drag events are sent to the callback function associated with the tree control when the user drags a tree item.
Splitter Controls—Drag events are sent at the beginning of the splitter operation.

This event is swallowable. Return 1 to swallow EVENT_DRAG.

Event Data Parameters:

For tree events:
eventData1	=	Not used
eventData2	=	itemIndex
For splitter events:
eventData1	=	Vertical coordinates of the current drag line position
eventData2	=	Horizontal coordinates of the current drag line position