new Ext.dd.DropZone onNodeDrop isn't called

Code:

        

var panelDropZone = new Ext.dd.DropZone(v.getEl(), {

                getTargetFromEvent: function(e) {
                        return e.getTarget('.my-div');  // allow to drop op this node.
                },

        //      While over a target node, return the default drop allowed class which
        //      places a "tick" icon into the drag proxy.
                onNodeOver : function(target, dd, e, data){

                    // onNodeOver is called: target contains = '.my-div'
                    return Ext.dd.DropZone.prototype.dropAllowed;
                },

                onNodeDrop : function(target, dd, e, data){
        
                    // onNodeDrop isn't called: why? 
                    return true;
                }
        });

I'm using ext-4.2.2.1118

If onNodeOver is called, why isn't onNodeDrop called; This shouldn't be the case according to the docs. Could this be a bug?

I'm trying to find the code that handles the onNodeXX events.

new Ext.dd.DropZone onNodeDrop isn't called