Adobe Extending Flash Professional CS5 - Manual (Page 409)

387 EXTENDING FLASH PROFESSIONAL
Shape object
Last updated 5/2/2011
Description
Read-only property; an array of Vertex objects (see
Vertex object ).
Example
The following example stores the first selected object in the
someShape variable, and then shows the number of vertices
for that object in the Output panel:
var someShape = fl.getDocumentDOM().selection[0];
fl.trace("The shape has " + someShape.vertices.length + " vertices.");