I am facing one issue with NScollectionview. When i load collection view it populates all elements. But when i scroll down it some blank area will show until i focus inside the NScollectionview. Same happens when i scroll up. I debug and found that after scrolling the Getitem calls only when i focus on the collectionview. Please help me resolve this issue.
I am developing in 10.12. I run the same application in 10.13 it works without any issue.