ThumbViewer.ThumbForXY
From Jeremie Leroy - XOJO Controls Wiki
Method
ThumbViewer.ThumbForXY ( X As Integer, Y As Integer, FindClosest As Boolean = False ) As Integer
Returns the Thumbnail indeX from the passed x, Y mouse coordinates.
If FindClosest is True, it will find the closest Thumbnail. If none is found it will return the ThumbNail count.