how to create an application in Flex?

Create a user interface using MXML to accept user-supplied keywords and display photos

  • Write a method and event handler using ActionScript
  • Request and handle RSS data from Flickr using Flex HTTPService
  • Create a bindable XML variable used to populate a Tile component
  • Cast data as XML
  • Create a namespace for the XML thumbnail and description data
  • Create an item renderer to display photo thumbnail and description in the Tile component
  • Create a custom component
  • Customize the application display

tutorial link: http://learn.adobe.com/wiki/display/Flex/1d.+RIA+Tutorial