//****** Button Dodawania Kraju ***************
        private void addCountryButton_Click(object sender, RoutedEventArgs e)
        {
            AddCountry countryWindow = new AddCountry();

            countryWindow.Owner = this;
            if (IsOpen == false)
            {
                countryWindow.deleteButton.Visibility = Visibility.Collapsed;
                countryWindow.Show();
                countryWindow.Topmost = true;
                IsOpen = true;
            }
        }
        //******** Button Edycja kraju ***********
        private void editCountryButton_Click(object sender, RoutedEventArgs e)
        {
            string id   = "";
            string name = "";
            string flag = "";
            string logo = "";

            if (countriesListBox.SelectedItems.Count == 1)
            {
                OpenConnection();

                MySqlCommand cmd = new MySqlCommand("Select * from countries  where Country_ID = (select Country_ID from countries where Country_Name ='" + CountryName + "')", conn);

                MySqlDataReader rd = cmd.ExecuteReader();

                while (rd.Read())
                {
                    id   = rd.GetString(0);
                    name = rd.GetString(1);
                    flag = rd.GetString(2);
                    logo = rd.GetString(3);
                }

                CloseConnection();

                AddCountry addCountryWindow = new AddCountry(id, name, flag, logo, true);
                addCountryWindow.Owner = this;
                if (IsOpen == false)
                {
                    addCountryWindow.Show();
                    IsOpen = true;
                }
            }
            else
            {
                MessageBox.Show("Prosze zaznaczyć kraj");
            }
        }