After my custom components FadingTextInput and FadingInjector, here is now a Flex custom effect offering similar possibilities. I called it EditInPlaceEffect.

Apply the fading background color effect available in my Flex FadingTextInput in any UIComponent by injecting it using FadingInjector (post updated following a comment from João).

FadingTextInput is a Flex custom component based on TextInput that provides a background color fading effect when its content is modified.