EditorWindow loosing reference on play how to fix

I already posted a thread of what the problem was here https://forum.unity.com/threads/editorwindow-loses-reference-on-play.506861/#post-3309611

I now simplified the classes to show only the key elements of what I try to do.

The main problem lies here the _sprite reference get lost when I play the scene.

Code (CSharp):

1. public class Child : Base {
2.     [SerializeField]
3.     private Image _image;
4.     [SerializeField]
5.     private Sprite _sprite;
6.  
7.     public override void DrawEditSettings() {
8.         GUILayout.BeginArea(new Rect(0, 20, 200, 500));
9.         _sprite = (Sprite)EditorGUILayout.ObjectField(_sprite, typeof(Sprite), true);
10.         if(_sprite != null) {
11.             _image.sprite = _sprite;
12.         }
13.         GUILayout.EndArea();
14.     }
15. }

The editor window also again nothing special maybe only the function DrawEditorSettings.

Code (CSharp):

1. public class EditorWindowBase : EditorWindow {
2.  
3.     WindowCreater _windowCreator;
4.  
5.     void OnGUI() {
6.         if(GUILayout.Button("Create a Base and add to WindowCreater")) {
7.             GameObject child = PrefabUtility.InstantiatePrefab(Resources.Load(@"TEMP/Childprefab")) as GameObject;
8.             child.transform.parent = _windowCreator.transform;
9.             _windowCreator._bases.Add(child.GetComponent<Base>());
10.         }
11.         //---------- here i call the function DrawEditorSettings only for the first item in the list for the question
12.         if(_windowCreator._bases.Count>0) {
13.             _windowCreator._bases[0].DrawEditSettings();
14.         }
15.     }
16.  
17.     public void SetValues(WindowCreater pWindowCreator) {
18.         _windowCreator = pWindowCreator;
19.     }
20. }

Here the code that creates the Editor Window nothings special but still.

Code (CSharp):

1. [CustomEditor(typeof(WindowCreater))]
2. public class WindowCreaterEditor : Editor {
3.     public override void OnInspectorGUI() {
4.         WindowCreater WindowCreater = (WindowCreater)target;
5.         if(GUILayout.Button("Create Winow")) {
6.             EditorWindowBase window = (EditorWindowBase)EditorWindow.GetWindow(typeof(EditorWindowBase));
7.             window.SetValues(WindowCreater);
8.             Selection.activeGameObject = WindowCreater.gameObject;
9.             SceneView.lastActiveSceneView.FrameSelected();
10.         }
11.     }
12. }
13.     public class WindowCreater : MonoBehaviour {
14.     public List<Base> _bases = new List<Base>();//public just for the question
15. }

And here the Base class just for measure

Code (CSharp):

1. public abstract class Base : MonoBehaviour {
2.     public abstract void DrawEditSettings();
3. }

Thanks in advance for helping me.

 

it finally worked found the solution

Code (CSharp):

1.         if(_sprite != null) {
2.             Undo.RecordObject(this, "Some Random text");
3.             _image.sprite = _sprite;
4.             EditorUtility.SetDirty(this);
5.         }