Leading (Textformat.leading Property) - MACROMEDIA FLASH 8-ACTIONSCRIPT 2.0 LANGUAGE Reference

fmt2.size = 50;
fmt2.color = 0x0000FF;
fmt2.kerning = true;
this.createTextField("tf1", this.getNextHighestDepth(), 10, 10, 400, 100);
tf1.embedFonts = true;
tf1.text = "Text 7AVA-7AVA";
tf1.setTextFormat(fmt1);
this.createTextField("tf2", this.getNextHighestDepth(), 10, 40, 400, 100);
tf2.embedFonts = true;
tf2.text = tf1.text;
tf2.setTextFormat(fmt2);
If your SWF file includes a version 2 component, use the version 2 components
DepthManager class instead of the method, which is
MovieClip.getNextHighestDepth()
used in this example.

leading (TextFormat.leading property)

public leading : Number
An integer that represents the amount of vertical space in pixels (called leading) between lines.
The default value is , which indicates that the property is undefined.
null
Flash Player 8 supports negative leading, meaning that the amount of space between lines is
less than the text height. Negative leading can be useful when you want to put lines of text,
such as headings, very close together. To prevent the overlap of text, you use negative leading
for lines of text that do not contain descenders, such as text that is all uppercase.
Availability: ActionScript 1.0; Flash Player 6
Example
The following example creates a text field and sets the leading to 10.
var my_fmt:TextFormat = new TextFormat();
my_fmt.leading = 10;
this.createTextField("my_txt", 1, 100, 100, 100, 100);
my_txt.multiline = true;
my_txt.wordWrap = true;
my_txt.border = true;
my_txt.text = "This is my first text field object text";
my_txt.setTextFormat(my_fmt);
TextFormat 1239