QGrahpicsItemGroup dropEvent for Children

I’am using Qt 4.6.3 and have a QGraphicsItemGroup and the children acceptDrops. If I drag something over a child the cursor changes but the item doesn’t get the dragEnter, drop, dragMove or dragLeave events. If the Items are not in a group it works fine.
Is there no other way then catching the events in an own Group Item and sending it to the child under the cursor ?