Android Question B4Xpage Key back Press

Hello, I would like to know how I can intersect the key_back_press event and make decisions depending on the page where it is, currently I have a CLV with users and when clicking on an element in the list it opens another page with the user's data, when doing back It takes me to the list, but when I click on another user and I want to return, the key back event does not work, I would like to condition it.. thank's
 
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