private void comboBoxChooseMom_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (comboBoxChooseMom.SelectedIndex != -1)
            {
                try
                {
                    comboBoxChooseChild.ItemsSource       = bl.getKids(a => a.idMom == Convert.ToInt64(comboBoxChooseMom.SelectedValue));
                    comboBoxChooseChild.DisplayMemberPath = "fullName";
                    comboBoxChooseChild.SelectedValuePath = "idChild";
                    comboBoxChooseChild.SelectedIndex     = -1;
                    contract                   = new BE.Contract();
                    contract.workBegin         = DateTime.Today;
                    contract.workEnd           = DateTime.Today;
                    addContractTab.DataContext = contract;
                    mom = (BE.Mother)comboBoxChooseMom.SelectedItem;

                    new Thread(() =>
                    {
                        try
                        {
                            copNanny = bl.getAllCompatibleNanny(mom).ToList();
                            Dispatcher.Invoke(new Action(() =>
                            {
                                dataGridDetalis.ItemsSource       = copNanny;
                                dataGridDetalis.SelectedValuePath = "nannyId";
                            }));
                        }
                        catch (Exception n)
                        {
                            MessageBox.Show(n.Message);
                        }
                    }).Start();
                }
                catch (Exception n)
                {
                    MessageBox.Show(n.Message);
                }
            }
        }