Flash MX 2004.
Library.setItemProperty(property, value)
stringThe name of the property to set. For a list of properties, see the Property summary table for the Item object and property summaries for its subclasses. To see which objects are subclasses of the Item object, see "Summary of the DOM structure" on Given Page.
anyThe value to assign to the specified property.
Nothing.
voidMethod; Sets the property for all selected library items (ignoring folders).
The following example assigns the value button to the symbolType property for the selected library item or items. In this case, the item must be a SymbolItem object; symbolType is a valid property for SymbolItem objects.
fl.getDocumentDOM().library.setItemProperty("symbolType", "button");