Setting yourself up to work with Scaleform
Scaleform does not require Adobe Flash, but that is the working environment for building UI content that is generally accepted and that Epic endorses through their documentation (http://udn.epicgames.com/Three/Scaleform.html#Setting up Adobe Flash Environment). It is best to work with a later version such as CS5, but CS4 also works. ActionScript 2 is easier to use, but ActionScript 3 is also supported, with increasing documentation (although none of the examples in this book depend on it). Autodesk provides lessons on using Scaleform within UDK: http://gameware.autodesk.com/scaleform/support/documentation.
Getting ready
This recipe assumes you already have Adobe Flash CS5 working. If you don't have it, and don't want to own it, you could try one of several free routes (such as using Vectorian Giotto and FlashDevelop).
How to do it...
Setting up Scaleform in Flash
In Flash, open a new .FLA, set to ActionScript2. In the menu Help | Manage Extensions click...