Detect mouse click on object in editor mode (OnSceneGUI())

Hi, I am trying to set up a level editor type thing where when you click an object in a grid it changes. It is all in 2d but when I try to raycast2d it does not pick up any collision. The objects have circlecollider2ds and below is how I am raycasting:

Code (CSharp):

1. RaycastHit2D hit = Physics2D.Raycast(HandleUtility.GUIPointToWorldRay(Event.current.mousePosition).origin, new Vector2(0, 0));

The origin is correct - I have checked it against the positions of the objects, but for some reason it isn't registering any hits.

Any advice or links would be greatly appreciated.

 

Just an update, I started Unity today, added a rigidbody2d to the object being clicked, it worked, removed it, it still worked. Don't know what changed overnight but it's fine now