private void AddNewCustomer_Click(object sender, RoutedEventArgs e)
{
AddNewCustomerWindow addCustomer = new AddNewCustomerWindow();
addCustomer.ShowDialog();
}
//Customer Management ###################################################################################################
//Button Add New Customer
private void button_ClickAddNewCustomer(object sender, RoutedEventArgs e)
{
AddNewCustomerWindow newCustomer = new AddNewCustomerWindow();
newCustomer.ShowDialog();
}