private bool AddChat()
        {
            AddChatViewModel acvm = new AddChatViewModel();
            AddChatWindow    acw  = new AddChatWindow(acvm);

            if (acw.ShowDialog() == true)
            {
                if (chatManager.AddChat(acvm.ChatName, acvm.Password))
                {
                    ChatTab chatTab = new ChatTab(acvm.ChatName);
                    ChatTabs.Add(chatTab);
                    return(true);
                }
            }
            return(false);
        }
 public bool AddMessage(string chatTabName, ChatMessage message)
 {
     lock (_locker)
     {
         var existing = ChatTabs.Where(c => c.Name == chatTabName);
         if (existing.Count() == 0)
         {
             ChatTab chatTab = new ChatTab(chatTabName);
             chatTab.ChatMessages.Add(message);
             ChatTabs.Add(chatTab);
         }
         else
         {
             existing.Select(c => { c.ChatMessages.Add(message); return(c); }).ToList();
         }
     }
     return(true);
 }