To start rendering a GUI in Scene View, we are going to make use of a message method part of the Editor class, OnSeceneGUI.

In terms of GUI creation, we can make use of all the techniques we learned in the previous chapters working with custom inspectors and editor windows. In this case, we are going to use a toolbar component like the one used in the Palette window to simulate the tabs.

To see how this works, we are going to create a toolbar attached to the left top corner of the scene view. Each item of this toolbar will be one of the possible modes.

Let's add this method with the following code inside the LevelInspector class:

private void DrawModeGUI() {
    List<Mode> modes = EditorUtils.GetListFromEnum<Mode>();
    List<string> modeLabels = new List<string>();
    foreach(Mode mode...