What is the best way to create a custom component that can be
used by more than one flex application? For example, I've made a
component that I want to be able to use in both a web flex
application, and one the runs on AIR.
Is there a way to add my own controls permanently to Flex
Builder 3 ?
You would create a library (SWC) for this. Then include your
library in the project settings. Otherwise, if you need to tweak
things the general convention is to put your component AS or MXML
files in src/com/yourdomain/yourcomponent.