Flash CS4 ActionScript 3.0 Tutorial
How to Assign Height Property to Button Symbols, Movie Symbols and Text with Flash ActionScript
The Height property controls an object's overall height. The values are set in pixels.
Movie Symbol with instance name heightMovie_mc
Add a Movie Symbol to the stage..
Select the ojbect and open the Properties panel (Cmd/F3 (PC-Ctrl/F3)). Type in the name heightMovie_mc for the Instance Name.
Add a new layer called Actions.
Option double-click (PC - Alt double-click) the keyframe in the Actions layer to open the ActionScript panel.
Copy/Paste the following code to the ActionScript panel.
heightMovie_mc.height = 100;
Test your movie by pressing Cmd/Return (PC - Ctrl/Enter). By setting height equal to 100, the object's height becomes 100 pixels.