code: public void addCustomAlertActionLocKey(String actionLocKey) throws JSONException {
  		Object value = actionLocKey != null ? actionLocKey : new JSONNull();
  		put("action-loc-key", value, getOrAddCustomAlert(), false);
  	}
docs: Create a custom alert (if none exist) and add a custom text for the right button of the popup.
  
  @param actionLocKey the title of the alert's right button, or null to remove the button
  @throws JSONException if the custom alert cannot be added because a simple alert already exists