I'd like to build a NSCollectionView similar to the one in iPhoto '11. I want to group several pictures in section, and create a section header as well. The section header of a specific section is always visible until the last element of that section is visible. You can take a look at the picture to see what I mean.

EDIT: I should add that the contents are not images.

enter image description here

Thanks in advance

cocoa xcode nscollectionview iphoto
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