public void DoLayout()
        {
            var externalListProp = property.FindPropertyRelative("externalSideCornerList");

            EditorGUILayout.PropertyField(externalListProp);
            if (!(externalListProp.FindPropertyRelative("externalObject").objectReferenceValue is IRectSideCornerListProvider))
            {
                rList.DoLayoutList();
            }
        }
        public override void OnInspectorGUI()
        {
            if (list == null)
            {
                return;
            }

            list.DoLayoutList();

            using (new EditorGUILayout.HorizontalScope()) {
                EditorGUILayout.Space();
                EditorGUILayout.Space();
                if (GUILayout.Button("Delete All") == true)
                {
                    UnityEngine.PlayerPrefs.DeleteAll();
                }
            }
        }