Improved Scroll Rect control, enables support for Nested Scroll Rects
1 Overview
3 Methods
4 Usage
6 See also
The Scroll Rect Ex control is a replacement version of the standard Scroll Rect. It’s purpose is to solve the common issue when Scroll Rect’s are nested which can prevent drag events from properly propagating from a child to a parent Scroll Rect.

This component does not expose public methods beyond inherited behaviour.
Simply replace the Scroll Rect script on a GameObject with the Scroll Rect Ex version using:
“Add Component -> UI -> Extensions -> ScrollRectEx”
Click to play
Credit CaptainSchnittchen
Sourced from - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-2011648