In actionscript 3 you must define all your imports correctly or you will receive errors when you compile.  If you are new to AS3, imports are like your headers.  It is always a pain for me to look up the correct import.  So I decided to make a list of all the full imports path for the events. 

You could always take the short cut and do import flash.events.*;  I am not a big fan of this.  I think this is coincided lazy programming.  It is good practice to put the full extension for each import package. 

Events Imports List

• import flash.events.ActivityEvent
• import flash.events.AsyncErrorEvent
• import flash.events.ContextMenuEvent
• import flash.events.DataEvent
• import flash.events.ErrorEvent
• import flash.events.Event
• import flash.events.EventDispatcher
• import flash.events.EventPhase
• import flash.events.FocusEvent
• import flash.events.FullScreenEvent
• import flash.events.HTTPStatusEvent
• import flash.events.IMEEvent
• import flash.events.IOErrorEvent
• import flash.events.KeyboardEvent
• import flash.events.MouseEvent
• import flash.events.NetStatusEvent
• import flash.events.ProgressEvent
• import flash.events.SecurityErrorEvent
• import flash.events.StatusEvent
• import flash.events.SyncEvent
• import flash.events.TextEvent
• import flash.events.TimerEvent