Third Party PhotonNetwork : Need help for Room.CustomProperties

Hello everyone !
Today I stuck on a huge problem for my multiplayer game.
So, I'm using PhotonNetwork and I'm trying to get a value from CustomProperties of the created room.
What I want to do is to load a scene according to the value associated with a key in Room.CustomProperties.
I don't know how to do this ... It would be so cool if anyone could help me !

Example :

ExitGames.Client.Photon.Hashtable roomParams = new ExitGames.Client.Photon.Hashtable();
roomParams.Add ("MAP", curMap); (where "curMap" is an variable defined before that contains the name of the scene to load)
RoomOptions options = new RoomOptions();
options.CustomRoomProperties = roomParams;

And here is the problem ... how to get this value to load a scene with PhotonNetwork.LoadLevel() ?

Thans you really to much ! ^^

 

EDIT : I finally found how to do it !