Scene view GUI.Window Draws Between 2 editorWindow

Hello, I have a complexe problem, I have a simple script who create an window in the scene view:



I would like to be able to put between the first and the end some stuff, from an outside EditorWindow.
Here I am in an EditorWindow in the OnGUI() method:

Code (CSharp):

1. NavigatorDraggable nav = new NavigatorDraggable();
2. nav.Init(0, 0, 120, 300);
3. nav.ShowEditorWindow(StuffToLoad);
4.  
5. public void StuffToLoad()
6. {
7.       Debug.Log("ici");
8.       GUILayout.Label("inside");
9. }

And here is my NavigatorDraggable struct, i use a delegate for passing my function into parametter, but I have also tryed Action, it doen't work neither...

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public struct NavigatorDraggable
7. {
8.     private Rect _windowMenu;
9.  
10.     public delegate void ContentToDrawDelegate();
11.     public ContentToDrawDelegate m_methodToCall;
12.  
13.     public void Init(float x, float y, float width, float height)
14.     {
15.         _windowMenu = new Rect(x, y, width, height);
16.     }
17.  
18.     /// <summary>
19.     /// called every frame,
20.     /// </summary>
21.     /// <param name="action"></param>
22.     public void ShowEditorWindow(ContentToDrawDelegate action)
23.     {
24.         m_methodToCall = action;
25.         _windowMenu = GUI.Window(0, _windowMenu, NavigatorWindow, "Navigator  ");
26.     }
27.  
28.     private void NavigatorWindow(int id)
29.     {
30.         GUI.DragWindow(new Rect(0, 0, 120 - 20, 20));  //allow to drag de window only at the top
31.  
32.         GUILayout.Label("first");
33.         m_methodToCall();
34.         GUILayout.Label("end");
35.     }
36. }

In the console, "ici" is printed, so the delegate or Action work, but nothing is drawn inside the Navigator between "first" and "and", why ?