tokens: While this does n't directly answer the need to call a method in page load , here are some options for checking for running process to control buttons or displaying messages outside of a popup .. .
ner_tags: O O O O O O O O O O O O O B-User_Interface_Element O O O O O O O O O O O O O B-User_Interface_Element O O O O O O B-User_Interface_Element O O