[dark256]

НА input поле такое таки можно точно также. Все, что есть в компонентах, реализуемо средствами AS с нуля.

Вот, собственно, весь ваш бином Ньютона (вложение ниже)

selectable (TextField.selectable property)
public selectable : Boolean

A Boolean value that indicates whether the text field is selectable. The value true indicates that the text is selectable. The selectable property controls whether a text field is selectable, and not whether a text field is editable. A dynamic text field can be selectable even if it is not editable. If a dynamic text field is not selectable, that means you cannot select its text. 

If selectable is set to false, the text in the text field does not respond to selection commands from the mouse or keyboard, and the text cannot be copied using the Copy command. If selectable is set to true, the text in the text field can be selected using the mouse or keyboard. You can select text this way even if the text field is a dynamic text field instead of an input text field. The text can be copied using the Copy command.


Example
The following example creates a selectable text field that constantly updates with the current date and time. 

this.createTextField("date_txt", this.getNextHighestDepth(), 10, 10, 100, 22);
date_txt.autoSize = true;
date_txt.selectable = true;

var date_interval:Number = setInterval(updateTime, 500, date_txt);
function updateTime(my_txt:TextField) {
    my_txt.text = new Date().toString();
}


The MovieClip.getNextHighestDepth() method used in this example requires Flash Player 7 or later. If your SWF file includes a version 2 component, use the version 2 components' DepthManager class instead of the MovieClip.getNextHighestDepth() method.