How can I display another enum?

Hey guys, i'm learning about Custom Editor and I need some help. Im trying to display another enum depending the option of the first enum. The code below "works", the second enum appears in the inspector but I can not change him.

 using UnityEngine;
 using System.Collections;
 using UnityEditor;
 
 [CustomEditor(typeof(RoomFeatures)), CanEditMultipleObjects]
 public class PropertyHolderEditor : Editor {
 
     public SerializedProperty 
         roomType_Prop,
         corridorType_Prop,
         roomExit_Prop,
         entrance_Prop,
         exit_Prop;
 
     void OnEnable () {
         // Setup the SerializedProperties
         roomType_Prop = serializedObject.FindProperty ("roomType");
         corridorType_Prop = serializedObject.FindProperty ("corridorType");
         roomExit_Prop = serializedObject.FindProperty ("roomExit");
         entrance_Prop = serializedObject.FindProperty ("entrance");
         exit_Prop = serializedObject.FindProperty ("exit");
 
     }
     
     public override void OnInspectorGUI() {
         serializedObject.Update ();
         
         EditorGUILayout.PropertyField(roomType_Prop);
 
         RoomFeatures.RoomType rt = (RoomFeatures.RoomType)roomType_Prop.enumValueIndex;
         RoomFeatures.CorridorType ct = (RoomFeatures.CorridorType)corridorType_Prop.enumValueIndex;
 
         switch( rt ) {
         case RoomFeatures.RoomType.Corridor:
             ct = (RoomFeatures.CorridorType)EditorGUILayout.EnumPopup ("Corridor Type:", ct);
             break;
 
         case RoomFeatures.RoomType.Room: 
             EditorGUILayout.PropertyField( roomExit_Prop, new GUIContent("Exit") );
             break;
         }
         
         
         serializedObject.ApplyModifiedProperties ();
     }
 }

And this is the RoomFeatures script:

 using UnityEngine;
 using System.Collections;
 
 [System.Serializable]
 public class RoomFeatures : MonoBehaviour 
 {
     public enum RoomType {Corridor, Room, BossRoom};
     public RoomType roomType;
 
     public enum CorridorType {Small, Long, VeryLong}
     public CorridorType corridorType;
 
     public bool roomExit = false;
 
     [System.Serializable]
     public class entrance
     {
         public enum Vertical {Left, Middle, Right};
         public enum Horizontal {Top, Center, Bot};
     }
 
     [System.Serializable]
     public class exit
     {
         public enum Vertical {Left, Middle, Right};
         public enum Horizontal {Top, Center, Bot};
     }
 }

 

Any help will be welcome, sorry if my english is not very good.

Iago C.