Unable to use with custom drag icon

[robinjanke]

return new DragAndDropList.withCustomDraggableBehavior(stations, onDragFinish: (before, after) { setState(() { StationModel data = stations[before]; stations.removeAt(before); stations.insert(after, data); this._favoritesService.updateFavoriteList(stations); }); }, itemBuilderCustom: ((BuildContext context, dynamic) { StationModel station = dynamic; DraggableDelegate draggableDelegate = new DraggableDelegate(); return new WidgetAndDelegate( new ListTile( title: new Text(station.name), trailing: MyDraggable( child: Icon(Icons.drag_handle), onDragStarted: draggableDelegate.onDragStartedListener, onDragCompleted: draggableDelegate.onDragCompleted, onMove: draggableDelegate.onMoveListener, feedback: new SizedBox( width: 150, height: 50, child: Text("Just for testing.."), ), childWhenDragging: null, maxSimultaneousDrags: 1, feedbackOffset: Offset(0, 0), data: stations, ), onTap: null, ), draggableDelegate); }), canBeDraggedTo: ((one, two) => true));

I am unable to use this with a custom button to drag the ListItem. Can you please explain what i done wrong?