tokens: I only know " classic " sencha , but this should work the same way : So you could just add the mapPanel ( but hidden ) to your tabPanel , and in the button handler show it while hiding the button panel .
ner_tags: O O O O O O B-Library O O O O O O O O O O O O O O O B-Class O O O O O O B-Class O O O O B-User_Interface_Element O O O O O O B-User_Interface_Element O O