text: #include <pebble.h>
  
  static Window *window;
  static TextLayer *text_layer;
  
  static void select_click_handler(ClickRecognizerRef recognizer, void *context) {
    text_layer_set_text(text_layer, "Select");
  }
  
  static void up_click_handler(ClickRecognizerRef recognizer, void *context) {
    text_layer_set_text(text_layer, "Up");
  }
  
  static void down_click_handler(ClickRecognizerRef recognizer, void *context) {
    text_layer_set_text(text_layer, "Down");
  }
  
  static void click_config_provider(void *context) {
    window_single_click_subscribe(BUTTON_ID_SELECT, select_click_handler);
    window_single_click_subscribe(BUTTON_ID_UP, up_click_handler);
    window_single_click_subscribe(BUTTON_ID_DOWN, down_click_handler);
  }
  
  static void window_load(Window *window) {
    Layer *window_layer = window_get_root_layer(window);
    GRect bounds = layer_get_bounds(window_layer);
  
    text_layer = text_layer_create(GRect(0, 72, bounds.size.w, 20));
    text_layer_set_text(text_layer, "Press a button");
    text_layer_set_text_alignment(text_layer, GTextAlignmentCenter);
    layer_add_child(window_layer, text_layer_get_layer(text_layer));
  }
  
  static void window_unload(Window *window) {
    text_layer_destroy(text_layer);
  }
  
  static void init(void) {
    window = window_create();
    window_set_click_config_provider(window, click_config_provider);
    window_set_window_handlers(window, (WindowHandlers) {
      .load = window_load,
      .unload = window_unload,
    });
    const bool animated = true;
    window_stack_push(window, animated);
  }
  
  static void deinit(void) {
    window_destroy(window);
  }
  
  int main(void) {
    init();
  
    APP_LOG(APP_LOG_LEVEL_DEBUG, "Done initializing, pushed window: %p", window);
  
    app_event_loop();
    deinit();
  }