Question How pass data from EditorWindow to PropertyDrawer

Just like when you click a Object field On Inspector , it will pop up a window to let you choose a object

I want to make a text field with a button ,when I click button ,it pop up a window for choosing string for that text field,like that:

Code (CSharp):

1.  
2. public class StringContainer : MonoBehaviour
3. {
4.     public SealedString Text;
5. }
6.  
7. [System.Serializable]
8. public struct SealedString
9. {
10.     public string Key;
11. }
12.  
13. [CustomPropertyDrawer(typeof(SealedString))]
14. public class SealedStringDrawer : PropertyDrawer
15. {
16.     public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
17.     {
18.         EditorGUI.BeginProperty(position, label, property);
19.  
20.         SerializedProperty key = property.FindPropertyRelative("Key");
21.  
22.         position = EditorGUI.PrefixLabel(position, new GUIContent(key.stringValue), GUI.skin.textField);
23.  
24.         if (GUI.Button(position, "Open Select Window"))
25.         {
26.             SelectWindow.Open();
27.         }
28.  
29.         EditorGUI.EndProperty();
30.     }
31. }
32.  
33.  
34.  
35.  
36. public class SelectWindow : EditorWindow
37. {
38.     public static void Open()
39.     {
40.         var window = GetWindow<SelectWindow>();
41.         window.Show();
42.     }
43.  
44.     private void OnGUI()
45.     {
46.         string[] strings = { "1", "2", "3", "4", "5" };
47.  
48.         EditorGUILayout.BeginVertical();
49.  
50.         foreach (var s in strings)
51.         {
52.             if (GUILayout.Button(s))
53.             {
54.                 //set the SealedString.Key = s,[B]How to do ?[/B]
55.             }
56.         }
57.  
58.         EditorGUILayout.EndVertical();
59.     }
60. }
61. [FONT=inherit]

[/FONT]

Note: PropertyDrawer is necessary，because I may use a complex data rather than string