public background : Boolean
Specifies if the text field has a background fill. If true, the text field has a background fill. If false, the text field has no background fill.
The following example creates a text field with a background color that toggles on and off when nearly any key on the keyboard is pressed.
this.createTextField("my_txt", this.getNextHighestDepth(), 10, 10, 320, 240);
my_txt.border = true;
my_txt.text = "Lorum ipsum";
my_txt.backgroundColor = 0xFF0000;
var keyListener:Object = new Object();
keyListener.onKeyDown = function() {
my_txt.background = !my_txt.background;
};
Key.addListener(keyListener);