Draw a Sphere. Pass this into handle functions.

Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.

Sphere Cap on the Scene View.

	// Draw one sphere on each axis of any GameObject that has 
	// the "DummySphereCapScript.js" script attached.
	
	@CustomEditor (DummySphereCapScript)
	class SphereCap extends Editor {
		
		var sphereSize : float = 1;
	
	    function OnSceneGUI () {
	    	Handles.color = Color.red;
	    	Handles.SphereCap(0,
				target.transform.position + Vector3(5,0,0),
				target.transform.rotation,
				sphereSize);
	    	Handles.color = Color.green;
	    	Handles.SphereCap(0,
				target.transform.position + Vector3(0,5,0),
				target.transform.rotation,
				sphereSize);    	
	    	Handles.color = Color.blue;
	    	Handles.SphereCap(0,
				target.transform.position + Vector3(0,0,5),
				target.transform.rotation,
				sphereSize);
	    }
	}

And the script attached to this Handle:

	//DummySphereCapScript.js
	
	Debug.Log("I have SphereCap Handles attached to this transform!");