// the method to be called when the panel is clicked
    static void PanelEvent(IntPtr p)
    {
        // get the clicked panel
        PANEL thisPanel =
            PANEL.createFromPointer(p);

        // change the color of the clicked panel
        thisPanel.bmap.bmap_fill(new Color(200, 0, 0), 50);
    }

// the main method called by the scheduler
    private static IEnumerable<ScheduleMethod> MyMainMethod()
    {
        // create a red panel and make it visible...
        PANEL p =
            PANEL.pan_create(null, 24);
        
        p.SHOW = true;
        p.size_x = 100;
        p.size_y = 100;
        p.pos_x = 300;
        p.pos_y = 300;
        p.bmap =
            BMAP.bmap_createblack(100, 100, 32);
        p.bmap.bmap_fill(new Color(0, 0, 255), 50);

        // assign the method to be called when the panel is clicked..
        p.event_ =
            PanelEvent;

        // use the mouse !!
        EngVar.mouse_mode = 4;
}

// the entry point of the program
    static void Main(string[] args)
    {
        // load an empty level
        EngFun.engine_open(null, null);
        EngFun.level_load(null);

        // start the scheduler
        Scheduler.StartScheduler(MyMainMethod);
    }