When using Drag-and-Drop enabled controls, you can use a public function called calculateDropIndex(event:DragEvent) to figure out where Flex will drop the element being dragged. This method is part of the ListBase class and is overridden for TileBase (which extends Listbase but is the superclass for containers that layout stuff horizontally).
Author: Arpit Mathur
Arpit Mathur is a Principal Engineer at Comcast Labs where he is currently working on a variety of topics including Machine Learning, Affective Computing, and Blockchain applications. Arpit has also worked extensively on Android and iOS applications, Virtual Reality apps as well as with web technologies like JavaScript, HTML and Ruby on Rails. He also spent a couple of years in the User Experience team as a Creative Technologist.
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Code Zen 
Hey, how do we calculate dropIndex within VBox.I want to do drag-drop operation inside a VBox. And on dropping the object I want to have similar effect like on Ely Greenfield’s blog. I am using a VBox as a container. And I dont want to use entire component of Ely. Can you help me out.
Thanks
ref:
http://demo.quietlyscheming.com/DragTile/DragDrop.html
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