Flex Custom Components Tutorial

I'm just getting started out with flex. Are there any easy to follow tutorials that give examples of creating custom components that pass data with custom events?

From stackoverflow

• Adobe has two:

  http://livedocs.adobe.com/flex/1/flex_builder_en/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Using_Flex_Builder&file=brady214.htm

  http://www.adobe.com/devnet/flex/quickstart/building_components_in_mxml/

  This tutorial has quite a few examples.

  http://tutorials.jenkov.com/flex-components/component-basics.html