[flexcoders] Override default keyboard behaviours

I'm working on the porting of an Oracle Forms application to Flex. My customer wants the same keyboard functionalities of the old application and i've some problems: 1) I've to implement my focus management using the TAB and SHIFT+TAB keys. How can i disable the default behaviour? 2) I've to use

[flexcoders] Converting Java objects to ActionScript

I'm trying to call a remote object that returns a List of String. After I've invoked the method Flex throws this Error: ArgumentError: Error #2004: One of the parameters is invalid. myFault: (mx.messaging.messages::ErrorMessage)#0 body = (Object)#1 clientId = (null) correlationId = "6D027