ReorderableList onMouseUpCallback doesn't work when draggable is set to true

I am using the ReorderableList, and I noticed that onMouseUpCallback does not trigger when the third option of the the ReorderableList is set to true like in the code below:

Code (CSharp):

1. list = new ReorderableList(evt.actions, typeof(MyAction),
2.             true, false, false, false);
3. list.onMouseUpCallback = (ReorderableList list) => {
4.   Debug.Log("any click");
5.   UnityEngine.Event currentEvent = UnityEngine.Event.current;
6.   if (currentEvent.button == 1) {
7.     Debug.Log("right click");
8.   }
9. };

Any thoughts on how to make it work when it is set to true?