Always show Custom Editor GUI

Questions & Answers
1

I have a custom editor script with OnSceneGUI and some GUI labels and buttons which all work nicely. However when I select a different object in the scene the GUI is no longer visible. How can I keep it so the GUI is always visible on the sceneview?

2

This is the answer, from the comments:

 using UnityEditor;
 
 public class MyCustomGUI {
     [MenuItem("Tools/ShowMyCustomGUI")]
     public static void InitGUI() {
         MyCustomGUI MCG = new MyCustomGUI();
         SceneView.onSceneGUIDelegate += MCG.RenderSceneGUI;
     }
 
     public void RenderSceneGUI(SceneView sceneview) {
         //Scene gui stuff
     }
 }