class foo : public Fl_Button{
    
    public:
        foo(int x, int y) : Fl_Button(x, y, 30, 30) 
        { }

    int handle(int e){
        int ret = Fl_Button::handle(e);
        switch(e){
            case FL_KEYDOWN:
                if(Fl::event_key() == FL_Up){
                    
                    //This part is making problem
                    fl_register_image()
                    Fl_JPEG_Image jpg ("image.jpg"),
                    image(jpg);
                   //end

                    position(x(), y() - 5);
                    window()->redraw();
                }             
        }
       return ret;
    }
};

int main(int argc, char** argv){
     Fl_Window *win = new Fl_Window(500, 500);
          foo *obj = new foo(30, 30);

          fl_register_images();
          Fl_JPEG_Image jpg("test.jpg");

          obj->image(jpg);
     win->show();
     return Fl::run();
}