Drag and drop is not actually supported on Spark Groups. It is a bug that those events are showing up in the code hints. I've logged it: http://bugs.adobe.com/jira/browse/SDK-23529
Thanks - Mike Morearty, Flash Builder
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Hi Stef (and Mike) -
Sorry, Mike swung by my cube to ask me about this and I misunderstood and gave him incorrect information.
So, inherited from UIComponent are several drag-related event listeners such that you can specify event handlers directly in your markup (MXML). Group and other Spark components inherit these properties since they extend from UIComponent. However, currently, nothing in the Spark component set are insturmented to understand drag gestures and dispatch the appropriate drag events. We are currently working on wiring this up in the Spark List, but Group and its derivatives do not have this support natively built in yet. We want to leave those event properties there such that external users could, if they wanted to, interpret mouse gestures to turn them into drag and drop actions.
Hopefully this makes sense.
Deepa Subramaniam, Flex SDK
Thanks for the answer.
Finally the dragEnter, dragExit, dragDrop events work on Group.
I don t understand why in the first time my events weren t handled ...