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What you are asking is a fairly advanced question. You can use the DragManager to drag and drop any UIComponent. You would need to create a component, extending UIComponent in which you draw the circle. Then you detect when the component instance is being dragged by the gesture of mouse-down + mouse-move. That's when you use the DragManager to take over. The DragManager will then trigger drag events on the target object.
You'd be best off reading up on the DragManager and practicing with some of the examples that go along with it.
sorry i am not getting you please explain more
The first step is to read about the DragManager and to work with the examples. There is also an Adobe Flex 2 book on the market, probably available at a local bookstore; it should also have examples. Once you are comfortable with the DragManager you'll see how to use any component class, and not just Image, as the drag proxy.