actionscript 3 - How to have a placeholder text and remove it when the first letter is inputted? -

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I'm reading on textevent to use it, but I'm also not sure how to be a holder.

What is placeholder text? Another dynamic text field? For example, on the Facebook app, it says email or phone on it, when I type a letter, "email or phone" disappears, but if I remove my input, the place holder will appear again it happens!

Somewhere I would appreciate to start, thank you!

I failed to link well, but I think "mask text input" Finding useful Flex components can be found.

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