[AS3] Drag and Drop + rollover

Hello,

I have some buttons, i need to drag and drop different movieclips on these buttons.
I use


myclip.addEventListener(MouseEvent.MOUSE_DOWN, on_mouseDownHandler);
myclip.addEventListener(MouseEvent.MOUSE_DOWN, on_mouseDownHandler,true);

and with


function on_mouseDownHandler(evt:MouseEvent):void {
    var object = evt.target;
    object.startDrag();
}

i can actually drag my clip around.
The problem is that when i drag my clip over a button, the button does not rollover.
If i move the mouse over a button (without dragging my movieclip), it changes to over state

I am missing something?

My goal is to have a rollover effect on “drag over” an area (simple button in my case)

Can anyone point me in the right direction?

Thank you!