uibutton - tvOS UICollectionView button focus on the cell -


i writting apple tv native app , have uicollectionview on viewcontroller. each cell of uicollectionview has 3 buttons on laid out in vertical line , able focus on them , have user click on focus 1 user can answer question on each cell. currently, focus engine not focusing on buttons on cell , not sure how tell focus engine should so. please provide instruction on how so? thanks, greg


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