I've posted the code at https://rapidshare.com/files/801556596/fltkWizard.zip since there doesn't seem to be a way to attach a .zip . The files are also shown below:

src/main.cpp
==============================================
#include <stdlib.h>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_GL_Window.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Wizard.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Multiline_Output.H>
#include <FL/gl.H>
#include <FL/Fl_Value_Slider.H>

class MyGlWindow : public Fl_Gl_Window {
    // FIX OPENGL VIEWPORT
    //     Do this on init or when window's size is changed
    void FixViewport(int W,int H) {
        glLoadIdentity();
        glViewport(0,0,W,H);
        glOrtho(-W,W,-H,H,-1,1);
    }
    // DRAW METHOD
    void draw() {
        if (!valid()) { valid(1); FixViewport(w(), h()); }      // first time? init
        // Clear screen to bg color
        glClearColor(0, 0, 0, 0);
        glClear(GL_COLOR_BUFFER_BIT);
        // Draw 'X' in fg color
        glColor3f(1, 1, 1);
        glBegin(GL_LINE_STRIP); glVertex2f(w(), h()); glVertex2f(-w(),-h()); glEnd();
        glBegin(GL_LINE_STRIP); glVertex2f(w(),-h()); glVertex2f(-w(), h()); glEnd();
    }
    // HANDLE WINDOW RESIZING
    void resize(int X,int Y,int W,int H) {
        Fl_Gl_Window::resize(X,Y,W,H);
        FixViewport(W,H);
        redraw();
    }

    virtual int handle(int event)
    {
        return Fl_Gl_Window::handle(event);
    }

public:
    // OPENGL WINDOW CONSTRUCTOR
    MyGlWindow(int X,int Y,int W,int H,const char*L=0) : Fl_Gl_Window(X,Y,W,H,L) {
        end();
    }
};

Fl_Wizard *G_wiz = 0;

void back_cb(Fl_Widget*,void*)
{
    G_wiz->prev();
}

void next_cb(Fl_Widget*,void*)
{
    G_wiz->next();
}

void done_cb(Fl_Widget*,void*)
{
    exit(0);
}


class MyAppWindow : public Fl_Window {
    MyGlWindow *mygl;                    // opengl window
public:
    // APP WINDOW CONSTRUCTOR
    MyAppWindow(int W,int H,const char*L=0) : Fl_Window(W,H,L) {
        // **************************************************
        // 1. OpenGL window. Want this to appear only in page 1.
        // Currently it overlaps on top of the Fl_Multiline_Output
        // windows.
        // **************************************************
        mygl = new MyGlWindow(10, 10, W-20, H-80);

        // **************************************************
        // 2. Would like the wizard buttons to stay the same size
        // during resize, shifting to adhere to the bottom and
        // right margins. Only the other windows should resize.
        // **************************************************
        G_wiz = new Fl_Wizard(0,0,W,H);

        // Wizard: page 1
        {
            Fl_Group *g = new Fl_Group(0, H-60, W, 60);
            Fl_Button *next = new Fl_Button(290,H-30,100,25,"Next"); next->callback(next_cb);
            g->end();
        }
        // Wizard: page 2
        {
            Fl_Group *g = new Fl_Group(0, H-60, W, 60);
            Fl_Button *next = new Fl_Button(290,H-30,100,25,"Next"); next->callback(next_cb);
            Fl_Button *back = new Fl_Button(120,H-30,100,25,"Back"); back->callback(back_cb);
            Fl_Multiline_Output *out = new Fl_Multiline_Output(10,30,W-20,H-80,"Terms And Conditions");
            out->labelsize(20);
            out->align(FL_ALIGN_TOP|FL_ALIGN_LEFT);
            out->value("This is the Second page");
            g->end();
        }
        // Wizard: page 3
        {
            Fl_Group *g = new Fl_Group(0, H-60, W, 60);
            Fl_Button *done = new Fl_Button(290,H-30,100,25,"Finish"); done->callback(done_cb);
            Fl_Button *back = new Fl_Button(120,H-30,100,25,"Back"); back->callback(back_cb);
            Fl_Multiline_Output *out = new Fl_Multiline_Output(10,30,W-20,H-80,"Finish");
            out->labelsize(20);
            out->align(FL_ALIGN_TOP|FL_ALIGN_LEFT);
            out->value("This is the Last page");
            g->end();
        }
        G_wiz->end();
        end();
    }
    virtual int handle(int event)
    {
        return Fl_Window::handle(event);
    }
};


// Simple 'wizard' using fltk's new Fl_Wizard widget

Fl_Window *G_win = 0;

int main(int argc, char **argv)
{
    // **************************************************
    // 3. On initial display of MyAppWindow the OpenGL window
    // is blank. It is not refreshed until the user interacts
    // with it. Is there a way to force a refresh? Or maybe
    // the OpenGL window isn't handled properly..
    // **************************************************
    int w = 500, h=300;
    G_win = new MyAppWindow(w,h,"Example Wizard");
    G_win->resizable(G_win);
    G_win->end();
    G_win->show(argc, argv);
    return Fl::run();
}

CMakeLists.txt
==============================================
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)

PROJECT( fltkWizard )
SET ( CMAKE_PROJECT_NAME "fltkWizard" )

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/Modules)

set(FLTK_ROOT_PATH "/usr/local")
find_package(FLTK REQUIRED)

FILE(GLOB_RECURSE SOURCE_FILES src/*.cpp src/*.h)

INCLUDE_DIRECTORIES ( ${PUBLIC_INCLUDE_DIRS} ${FLTK_INCLUDE_DIR})

set(CMAKE_EXE_LINKER_FLAGS "-framework OpenGL -framework AGL -framework AppKit -framework Cocoa -framework ApplicationServices")

set(CMAKE_BUILD_TYPE Debug)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g" )

ADD_EXECUTABLE ( ${CMAKE_PROJECT_NAME} ${SOURCE_FILES} )
TARGET_LINK_LIBRARIES( ${CMAKE_PROJECT_NAME} ${LIBRARIES} ${FLTK_LIBRARIES})
INSTALL(TARGETS ${CMAKE_PROJECT_NAME} RUNTIME DESTINATION ${CMAKE_CURRENT_SOURCE_DIR}/bin COMPONENT RUNTIME)

SET_TARGET_PROPERTIES( ${CMAKE_PROJECT_NAME} PROPERTIES OUTPUT_NAME ${CMAKE_PROJECT_NAME} )

Modules/FindFLTK.cmake
==============================================
# - try to find FLTK Debug include files
#  FLTK_INCLUDE_DIR, where to find FLTK/fltk.h, etc.
#  FLTK_LIBRARIES, the libs
#  FLTK_FOUND, If false, do not try to use FLTK.

IF (WIN32)
  FIND_PATH( FLTK_INCLUDE_DIR NAMES fltk/fltksdk.h
    PATHS  ${FLTK_ROOT_PATH}/include )
ELSE (WIN32)

  IF (APPLE)
    # These values for Apple could probably do with improvement.
    FIND_PATH( FLTK_INCLUDE_DIR FL/Fl.H
      ${FLTK_ROOT_PATH}/include
      )
    FIND_LIBRARY( FLTK_FLTK_LIBRARY NAMES fltk
      PATHS
      ${FLTK_ROOT_PATH}/lib/
      )
    FIND_LIBRARY( FLTK_malloc_LIBRARY NAMES fltk_gl
      PATHS
      ${FLTK_ROOT_PATH}/lib/
      )
    FIND_LIBRARY( FLTK_malloc_LIBRARY NAMES fltk_images
      PATHS
      ${FLTK_ROOT_PATH}/lib/
      )
    FIND_LIBRARY( FLTK_malloc_LIBRARY NAMES fltk_forms
      PATHS
      ${FLTK_ROOT_PATH}/lib/
      )
  ELSE (APPLE)
    FIND_PATH( FLTK_INCLUDE_DIR fltk/fltk.h
      ${FLTK_ROOT_PATH}/include
      )
    FIND_LIBRARY( FLTK_FLTK_LIBRARY NAMES fltksdk-2013.1
      PATHS
      ${FLTK_ROOT_PATH}/lib/
      )
    FIND_LIBRARY( FLTK_malloc_LIBRARY NAMES fltkmalloc
      PATHS
      ${FLTK_ROOT_PATH}/lib/
      )
  ENDIF (APPLE)
ENDIF (WIN32)

INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLTK
                                  REQUIRED_VARS FLTK_FLTK_LIBRARY FLTK_malloc_LIBRARY FLTK_INCLUDE_DIR)

IF (FLTK_FOUND)
  SET( FLTK_LIBRARIES
    ${FLTK_FLTK_LIBRARY}
    ${FLTK_malloc_LIBRARY}
    )
  SET (FLTK_INCLUDE_PATH ${FLTK_INCLUDE_DIR})
ELSE(FLTK_FOUND)
  MESSAGE("FLTK NOT FOUND!!!")
ENDIF(FLTK_FOUND)

MARK_AS_ADVANCED(
  FLTK_INCLUDE_DIR
  FLTK_FLTK_LIBRARY
  FLTK_malloc_LIBRARY
  )





> hi all..
>
> I would like to place an OpenGL window into a wizard, but I'm new to fltk so my source has some problems. I'm using 1.3.0 I'm on OSX Lion 10.7.3 64-bit.
>
> 1. the OpenGL window overlaps all of the wizard pages. It should only appear on the first page.
>
> 2. the OpenGL window is blank until the user interacts with it. Perhaps there is a way to force a refresh on startup? I suspect there is a problem which prevents this from occurring.
>
> The project is attached.. it's derived from a merge of the Fl_Wizard and the "OpenGL Example with Widgets" demo at http://seriss.com/people/erco/fltk (a rather handy page).
>
> If anyone has any ideas it would be appreciated.
>
> thanks!