[fltk.opengl] How to enable Drag n Drop on OpenGL window ?

[Furqan]

My application is OpenGL based. I have created an OpenGL windows inside of 
Fl_Double_Window.

Now here is the simple code for drag n drop, copied from an example.

// SIMPLE RECEIVER CLASS
class Receiver : public Fl_Box {
public:
        // Ctor
        Receiver(int x,int y,int w,int h) : Fl_Box(x,y,w,h) {
                box(FL_FLAT_BOX); color(10); label("..to\nhere");
        }
        // Receiver event handler
        int handle(int event) {
                int ret = Fl_Box::handle(event);
                switch ( event ) {
                case FL_DND_ENTER: // return(1) for these events to 'accept' dnd
                case FL_DND_DRAG:
                case FL_DND_RELEASE:
                        ret = 1;
                        break;
                case FL_PASTE: // handle actual drop (paste) operation
                        label(Fl::event_text());
                        fprintf(stderr, "Pasted '%s'\n", Fl::event_text());
                        ret = 1;
                        break;
                }
                return(ret);
        }
};

In my application I code like this..

MainWindow = new Fl_Double_Window(WINDOW_SIZE_W, WINDOW_SIZE_H, "");

Receiver box(0,0,WINDOW_SIZE_W, WINDOW_SIZE_H);

MainWindow->end();
MainWindow->show(argc, argv);

Now the issue is, when I drag n drop one file over the OpenGL screen it doesn't 
accept the file. File only accepted if I drop on the "Receiver box". But my 
application screen is totally covered with the OpenGL screen, so, how can I 
enable Drag n Drop on the OpenGL screen ?

Any idea ?

thanks.
furqan
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