Helpers.rotateTool doesn't work

```
Helpers.rotateTool = function(object)
{
	var tool = new Circle();
	tool.radius = 4;
	tool.layer = object.layer + 1;
	tool.onPointerDrag = function(pointer, viewport, delta)
	{
		object.rotation += delta.x * 1e-3;
	};
	object.add(tool);
};
```

Does is need to add one line of "tool.draggable = true;"？