Кнопка с иконкой FLTK

class Button_img : public Button
{
public:
    Button_img(const Point& p, int _w, int _h, const string& l, Callback cb, const string& img_name);
 
    void attach(Graph_lib::Window& win);
 
    ~Button_img() { delete im; }
private:
    string img_name;
    Image* im;
};
 
Button_img::Button_img(const Point& p, int _w, int _h, const string& l,
    Callback cb, const string& _img_name) :Button(p, _w, _h, l, cb), img_name(_img_name)
{
    if (img_name.empty())
        Bad_image(80, 120);
 
    
    im = new Image(Button::loc, img_name, Suffix::bmp);
    //im->set_mask(p, _w, _w);
    
}
 
void Button_img::attach(Graph_lib::Window& win)
{
    Button::attach(win);
    //win.attach(*im);
}

#include<FL\Fl.h>
 
#include<FL\Fl_Box.h>
#include<FL\Fl_Window.h>
#include<FL\Fl_BMP_Image.h>
#include<FL\Fl_Button.h>
 
 
using namespace Graph_lib;
 
 
void cb_hi(Fl_Widget*, void* d)
{
    cerr << "Hi. You pressed button" << endl;
}
 
void cb_resizable(Fl_Widget* w, void* d)
{
    cerr << "\t\tbutton resize" << endl;
    
    Fl_Button* b = (Fl_Button*)w;
    Fl_Image* im = (Fl_Image*)d;
    if (im)
    {
        im = im->copy(b->w() - 3, b->h() - 4);
        b->image(im);
    }
    //b->redraw();
}
 
 
int main()
{
    Fl_Window* win = new Fl_Window(100, 100, 640, 420, "");
 
    win->begin();
    Fl_Button* b1 = new Fl_Button(640 / 2 - 35, 420 / 2 - 15, 70, 30);
 
    b1->box(Fl_Boxtype(FL_UP_BOX | FL_UP_FRAME));
 
    b1->callback(cb_hi);
    
 
    Fl_Image* im1 = new Fl_BMP_Image("D:\\Library\\8.bmp");
    Fl_Image* im2 = im1->copy(b1->w()-3, b1->h()-4);
    
    
    //b1->callback(cb_resizable);
    b1->image(im2);
    
    //b1->deimage(im1);
    
    win->resizable(win);
    
 
    win->end();
    win->show();
    return Fl::run();
}