Button::Button( int X, int Y, int W, int H, const char* L ) :
        Fl_Button( X, Y, W, H, L )
    {
        box( FL_FLAT_BOX ); // here it does not work
    }

    void Button::draw()
    {
        if (type() == FL_HIDDEN_BUTTON) return;
        Fl_Color col = value() ? selection_color() : color();
        box( FL_FLAT_BOX );  // here it works

        draw_backdrop();
        if (labeltype() == FL_NORMAL_LABEL && value()) {
            Fl_Color c = labelcolor();
            labelcolor(fl_contrast(c, col));
            draw_label();
            labelcolor(c);
        } else draw_label();
        if (Fl::focus() == this) draw_focus();
    }

Can someone explain me why and how do I go around it?

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