несколько ссылочек по теме xml , mxml, actionscript
http://www.gamedev.net/reference/articles/article2371.asp
http://www.scribd.com/doc/136930/Creating-and-Extending-Flex-Components
http://livedocs.adobe.com/flex/201/html/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Book_Parts&file=intro_138_08.html
http://www.adobe.com/devnet/flex/quickstart/building_components_in_mxml/#advanced_mxml
http://lifeflex.shaggysmile.com/cookbook/runtime_skinning_and_styling.html
http://en.wikipedia.org/wiki/XML_data_binding
http://flexlabs.ru/index.php?option=com_content&task=view&id=19&Itemid=31