So here it is. This ZIP file contains two projects:
MyLibraryis the main interesting part. It contains
design.xml, a Flex manifest, and a sample component. See the slides (linked above) for an explanation of how all this stuff hooks together.
MyFlexProjectis just a simple Flex Project that has
MyLibraryon its library path, so that you can see that when you open the Flex project’s main app in design view, the library’s Calculator component shows up in the “Mike’s stuff” folder of the Components view (as opposed to the default, the “Custom” folder), and that if you click on the calculator that is already in the document, the list of properties in the Properties view has been customized, with the “Layout:” property showing up there.
To reiterate, the sample by itself isn’t quite enough – you really need to see the slides (starting at slide #23) to understand the context. And, I will soon be writing an Adobe Developer Center article with much more detail.