private void AddNewCustomer_Executed(object sender, ExecutedRoutedEventArgs e)
 {
     var addCustomerDialog = new AddNewCustomer();
     addCustomerDialog.SetParent(StartGrid);
 }
 private void AddCustomerLink_Click(object sender, MouseButtonEventArgs e)
 {
     var res = new AddNewCustomer();
     res.SetParent(StartGrid);
 }