private void btn_start_Click(object sender, RoutedEventArgs e)
{
if (Init())
{
client.Command();
btn_start.IsEnabled = false;
txt_drone_ip.IsEnabled = false;
btn_ip_list.IsEnabled = false;
check_joystick_mode.IsEnabled = false;
menu_curve_editor.IsEnabled = true;
menu_query.IsEnabled = true;
}
}