public void dragEnter(DropTargetDragEvent dtde) {
//notify additionalListeners
for (int i = 0; i < _additionalListeners.size(); i++) {
DropTargetListener l = (DropTargetListener) _additionalListeners
.elementAt(i);
l.dragEnter(dtde);
}
if (dtde.isDataFlavorSupported(PtolemyTransferable.namedObjFlavor)) {
dtde.acceptDrag(DnDConstants.ACTION_COPY_OR_MOVE);
} else {