public void InitializeMedia()
        {
            var app = MainWindow.chatApplication;

            if (app.model.MediaMessages.ContainsKey(ConversationID))
            {
                var medias = app.model.MediaMessages[ConversationID];

                for (int i = 0; i < medias.Count; ++i)
                {
                    var media = medias[i];
                    MediaPlayer.AddMediaItem
                    (
                        conversationID: ConversationID,
                        fileID: media.FileID,
                        fileName: media.FileName,
                        position: medias.Count - i - 1
                    );
                }
            }
            else
            {
                app.model.MediaMessages.Add(ConversationID, new List <Utils.MediaPack>());
            }
            MediaPlayer.ConversationID = ConversationID;
        }