Custom Editors For Custom Components Doesn't Get Onscenegui

I've got a custom component, with, among other things, a bezier curve used to help position the camera:

Code (csharp):

1. public class MyComponent : CinemachineComponentBase {
2.     public BezierCurve curve;
3. }

With a custom editor that tried to draw this bezier:

Code (csharp):

1. [CustomEditor(typeof(MyComponent))]
2. public class MyComponentEditor : Editor {
3.     private SerializedField p0, p1, p2, p3; // fetched in OnEnable()
4.  
5. ...
6.  
7.     void OnSceneGUI() {
8.         var basePos = target.transform.position;
9.  
10.         var p0Pos = basePos + p0.vector3Value;
11.         var p1Pos = basePos + p1.vector3Value;
12.         var p2Pos = basePos + p2.vector3Value;
13.         var p3Pos = basePos + p3.vector3Value;
14.  
15.         Handles.DrawBezier(p0Pos, p3Pos, p1Pos, p2Pos, Color.white, null, 1f);
16.     }
17. }

And this doesn't work! My custom inspector draws correctly, but OnSceneGUI doesn't get called. I believe this is because you're not really attaching components to the vCam's GameObject, but rather to an invisible "CM" GameObject?

Now, I can fix this by assigning to SceneView.onSceneGUIDelegate:

Code (csharp):

1. private void OnEnable() {
2.     SceneView.onSceneGUIDelegate += OnSceneGUI;
3. }
4.  
5. private void OnDisable() {
6.     SceneView.onSceneGUIDelegate -= OnSceneGUI;
7. }
8.  
9. private void OnSceneGUI(SceneView sceneview) {
10.     OnSceneGUI();
11. }

, but this feels hacky. Any chance you could handle this internally, so OnSceneGUI for custom component inspectors works as intended?