//otwiera okno faktur
public void invoices_button_click(object sender, RoutedEventArgs e)
{
Invoices_Window invoices_window = new Invoices_Window(_loggedInAccount);
this.Close();
invoices_window.ShowDialog();
}
//faktury
private void invoices_button(object sender, RoutedEventArgs e)
{
Invoices_Window invoices_window = new Invoices_Window();
this.Close();
invoices_window.ShowDialog();
}