Flash MX 2004.
stroke.dotSize
Property; a string that specifies the dot size of a stippled line. This property is available only if the stroke.style property is set to stipple (see stroke.style). Acceptable values are "tiny", "small", "medium", and "large".
The following example sets the dotSize property to tiny for the stroke style of stipple:
var myStroke = fl.getDocumentDOM().getCustomStroke();
myStroke.style = "stipple";
myStroke.dotSpace= 3;
myStroke.dotsize = "tiny";
myStroke.variation = "random sizes";
myStroke.density = "sparse";
fl.getDocumentDOM().setCustomStroke(myStroke);