private void ContactAddClick(object sender, RoutedEventArgs e) { ContactsVM contacts = new ContactsVM { IsPartnerAdd = ((PartnerFormVM)DataContext).ChosenPartner.ID, PartnerContactList = ((PartnerFormVM)DataContext).ContactsList }; PartnersWindow partners = new PartnersWindow { DataContext = contacts, Title = "Elérhetőségek" }; contacts.LoadPartnersList(); partners.ShowDialog(); }