shader for translate, rotate, scale affordances

I like the transform affordances (translate axes, rotation circles, scale axes) shader for a couple reasons:

1. They're lit.
2. They're rendered on top of the objects they're being applied toward.
3. They stay the same absolute size across editor camera pans and so forth.

Is this shader available? What are the clutch aspects of such a shader if one wanted to recreate it?

thanks!

 

I was able to piece together the following surface shader which demonstrates the desired behavior. Critiques welcome!

Code (CSharp):

1. Shader "Custom/Handles_Shader" {
2.     Properties {
3.         _MainColor ("Main Color", Color) = (1, 1, 1, 1)
4.     }
5.     SubShader {
6.         Tags { "RenderType"="Transparent" "Queue"="Overlay" }
7.         LOD 200
8.         ZTest Always
9.  
10.         CGPROGRAM
11.         #pragma surface surf Lambert
12.  
13.         struct Input {
14.             float4 color : COLOR;
15.         };
16.         float4 _MainColor;
17.         void surf (Input IN, inout SurfaceOutput o) {
18.             o.Albedo = _MainColor.rgb;
19.         }
20.         ENDCG
21.     }
22.     FallBack "Diffuse"
23. }