Bindable meta tag

早安~晨型人，　我今天睡到七點半... >,<
就是[Bindable]這個東東，很常看到，但不知道是什麼鬼。
原來它很強大呢!!

官方的描述：
When a property is the source of a data binding expression, Flex automatically copies the value of the source property to any destination property when the source property changes. To signal to Flex to perform the copy, you must use the [Bindable] metadata tag to register the property with Flex, and the source property must dispatch an event.

Ticore's Blog有簡單的介紹。