The test actor has a component “UTestSceneComponent”, in BugReport01Editor.cpp I register a ComponentVisualizer for the “UTestSceneComponent”
TSharedPtr<FComponentVisualizer> Visualizer = MakeShareable(new FTestActorComponentVisualizer());
if (Visualizer.IsValid() && GUnrealEd) {
GUnrealEd->RegisterComponentVisualizer(UTestSceneComponent::StaticClass()->GetFName(), Visualizer);
}