User Interface Components

Hello All, I am still learning ActionScript 3.0 but i feel i am genuinely improving all the time.

Anyhow, i need a little bit of help. I am building a small basic chat app in Flash. I have a button component, a text input component and a text area component on the stage.

I want my users to type and edit their message in the text input area and when they click the send button their message will be moved from the TextInput and displayed inside the text area.

Does anyone know how i can do this?