public bottomScroll : Number [read-only]
An integer (one-based index) that indicates the bottommost line that is currently visible the text field. Think of the text field as a window onto a block of text. The property TextField.scroll is the one-based index of the topmost visible line in the window.
All the text between lines TextField.scroll and TextField.bottomScroll is currently visible in the text field.
The following example creates a text field and fills it with text. You must insert a button (with the instance name "my_btn"), and when you click it, the scroll and bottomScroll properties for the text field are then traced for the comment_txt field.
this.createTextField("comment_txt", this.getNextHighestDepth(), 0, 0, 160, 120);
comment_txt.html = true;
comment_txt.selectable = true;
comment_txt.multiline = true;
comment_txt.wordWrap = true;
comment_txt.htmlText = "<b>What is hexadecimal?</b><br>"
+ "The hexadecimal color system uses six digits to represent color values. "
+ "Each digit has sixteen possible values or characters. The characters range"
+ " from 0 to 9 and then A to F. Black is represented by (#000000) and white, "
+ "at the (pposite end of the color system, is (#FFFFFF).";
my_btn.onRelease = function() {
trace("scroll: "+comment_txt.scroll);
trace("bottomScroll: "+comment_txt.bottomScroll);
};