Using the UI Emulator to display and test your asset
After you have created a new SWF file and created the UIElement XML file for the HUD, you now want to see the new HUD in Sandbox to make sure everything works as expected.
The UI Emulator is a tool that helps a lot during Flash development for CryENGINE. You can reload your SWF files directly to see your changes on the fly. Further, you can call your ActionScript functions and set the variables in this tool to see if your XML mapping works and your ActionScript functions are doing what you expect.