Here's a start:
The thing is that most back-end and lists need a bit of tweeking etc to make them functional.
Does this help?
That is a nice tutorial. The key point is you are going to have to take the project into Flash Builder 4 and add some code to make it happen. A couple of warnings, in Flash Catalyst 1.0 this is a one way trip. Once you open and edit your project in Flash Builder, Flash Catalyst will no longer be able to open it. Also depending on the twitter feed you might encounter authorization issues.