private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
_viewmodel = e.NewValue as ChatViewVm;
if (_viewmodel != null)
{
_viewmodel.OnMessagesChanged += OnMessagesChanged;
}
}
public MainWindowVm()
{
_chatService = new ChatService();
_chatService.ConnectedChanged += OnConnectedChanged;
_chatView = new ChatViewVm(_chatService);
_loginView = new LoginViewVm(_chatService);
CurrentView = _loginView;
}