protected void initDND() {
if (dndGroup == null) {
dndGroup = getId() + "-group";
}
ListViewDragSource source1 = new ListViewDragSource(fromField.getListView());
ListViewDragSource source2 = new ListViewDragSource(toField.getListView());
source1.setGroup(dndGroup);
source2.setGroup(dndGroup);
ListViewDropTarget target1 = new ListViewDropTarget(fromField.getListView());
target1.setAutoSelect(true);
ListViewDropTarget target2 = new ListViewDropTarget(toField.getListView());
target2.setAutoSelect(true);