Opengles 1.1 extend API

I have used the EGL pbuffers for the same Opengles 1.1 extend API  support, such as glGenRenderbuffersOES , glBindRenderbufferOES glGenFramebuffersOES. But I had another problem , I cann’t get the nativewindow for the framebuffer. When I use the eglCreateWindowSurface(), I find the DummyScreen structure for nativeWindowType of the function. But how can I use the structure, or how can i get the native window for the eglCreateWindowSurface(),.

Can you give me some advices ? thanks a lot

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