I'm working on a NSOutlineView (SourceList) and want the replace the current styling with my own to get a better look for my app. I've changed the default header and content cells with custom NSTableViewRows. This works fine. But now I can see a space between the groups. These space is about 9 Pixels and I want to remove it. But I don't know how. Changing the cell spacing didn't help and I didn't find anything in the developer reference to do that. Is there anybody who can give me a hint or a snippet? that would be great.
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* Group 1
- Item 1
- Item 2
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// this space should be changed
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* Group 2
- Item 3
- Item 4
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Thank you. Alex