iOS Reproducing Contact's "disappearing" search bar behavior

hi there,

my app is very similar to Contacts app, but unlike the Contacts app, i can't get my app to get rid off the search bar at the top when contact names are flicked through.

when contact list is not in search mode i set search bar as a header for an empty section at the top of a list. when it goes to search mode, i tried to remove search bar from table view and set it as a sibling of tableview.

any suggestions on how to get this going? thanks.