Refresh combobox list from other window, MVVM

Question

I\'m working on some application and I have one problem. I have two windows (Bookings - parent and Guests - child). In the parent window, I have one combo box with list of guest

Answer 1

Just use your already existent connection to your GuestViewModel from your BookingsViewModel.

The following suggestion is not tested but you will get the idea

public ICommand btnAddGuest    // Command for opening child window
    {
        get
        {
            if (_btnAddGuest == null)
            {
                _btnAddGuest = new DelegateCommand(delegate()
                {
                    try
                    {
                        Guests guest = new Guests();
                        guest.ShowDialog();

                        // Add some Logic here and an is save check property to your GuestVM
                        // sample solution
                        // var vm = guest.DataContext as GuestViewModel;
                        // if(vm != null)
                        //     if(vm.IsSaved)
                        //     {
                        //         var model = vm.Guest as tblGuest;
                        //         Guests.Add(model);                // will add him to your list
                        //         Guest = model                     // will add him at your selected Guest
                        //     }
                    }
                    catch
                    {
                        Trace.WriteLine("working...", "MyApp");
                    }
                });
            }
            return _btnAddGuest;
        }
    }