Colors of the handles.

	// Simple script that creates a Magenta Slide Handle that 
	// points to (0,0,0) nomatter where the target GameObject is located.
	
	@CustomEditor (Slide)
	class SliderHandleJS extends Editor {
		function OnSceneGUI () {
			Handles.color = Color.magenta;
	        target.vectorPoint = Handles.Slider (target.vectorPoint, 
	      						Vector3.zero - target.transform.position);
	        if (GUI.changed)
	            EditorUtility.SetDirty (target);
	    }
	}

	// Usage: Place this script on the Game Object you want to use the
	// editor-created slide handle.
	
	@script ExecuteInEditMode()
	
	var vectorPoint : Vector3 = Vector3(0,0,0);
	
	function Update() {
		Debug.Log("Looking at: " + vectorPoint);
	}