6.19 Expand Event

Description:	Generated when a Node object in the TreeView control is expanded. The event is generated after the Click and DblClick events.
Used in controls:	TreeView
Used in objects:	None.
Parameters:	1.[VT_I4 - Index S9(9) COMP-5] 2. VT_DISPATCH - Node OBJECT REFERENCE POW-CNODE
Description of parameters:	Index: When the control is part of an array, Index contains the control's index in the array. Node: Pointer to the Node object that is being expanded.