#include <Elementary.h>
void
_btn_cb(void *data, Evas_Object *obj, void *event_info)
{
   Evas_Object *nf = data, *btn;
   if (!nf) return;
   elm_object_text_set(btn, "Go to Second Page.");
   evas_object_smart_callback_add(btn, "clicked", _btn_cb, nf);
}
EAPI_MAIN int
elm_main(int argc, char **argv)
{
   Evas_Object *win, *nf, *btn;
   evas_object_size_hint_weight_set(nf, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   evas_object_show(nf);
   elm_object_text_set(btn, "Go to Second Page.");
   evas_object_smart_callback_add(btn, "clicked", _btn_cb, nf);
   evas_object_resize(win, 400, 400);
   evas_object_show(win);
   return 0;
}