Flash CS3 Professional.
OvalObject.innerRadius
Read-only property; a float value that specifies the inner radius of the Oval object as a percentage. Acceptable values are from 0 to 99. To set this value, use document.setOvalObjectProperty().
The following example sets the inner radius of selected Oval objects to 50 percent:
fl.getDocumentDOM().setOvalObjectProperty("innerRadius",50);