bindContextMenu and relatedTarget

Hi, I have bound a menu to layers in a geoJSON onEachFeature but the related target comes back as undefined:

```
layer.bindContextMenu({
		contextmenu: true,
		contextmenuInheritItems: false,
		contextmenuItems: [{
				text: "Edit",
				callback: function(e) {
					console.log(e.relatedTarget)
				}
			}
		]

})
```