//ctor
public ContactsViewModel(IFrameNavigationService navigationService)
{
_navigationService = navigationService;
_userManager = new ClientUserManager();
_interactionManager = new ClientInteractionManager();
ContactList = ConvertUserForUserView.ConvertUser(_userManager.GetContactList());
_userManager.RegisterNotifyEvent(ContactUptaded);
_interactionManager.RegisterInvitationResponseEvent(HandleUserResponse);
_interactionManager.RegisterChatRequestEvent(AgreeChatRequest);
LogoutCommand = new RelayCommand(Logout);
OpenChatCommand = new RelayCommand(OpenChat);
OpenGameCommand = new RelayCommand(OpenGame);
UserTitle = $"Welcome {ClientUserManager.CurrentUser}";
}