Flash MX 2004.
None.
An array of the zero-based index values of the selected layers.
Method; gets the zero-based index values of the currently selected layers.
The following example displays 1,0 in the Output panel:
fl.getDocumentDOM().getTimeline().setSelectedLayers(0);
fl.getDocumentDOM().getTimeline().setSelectedLayers(1, false);
var layerArray = fl.getDocumentDOM().getTimeline().getSelectedLayers();
fl.trace(layerArray);