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copied!<p>The data cell of a column isn't copied. The cell is configured for the proper value for the column in each row and drawn in its proper place. A good place to hook in is at the NSTableColumn method <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/ApplicationKit/Classes/NSTableColumn_Class/Reference/Reference.html#//apple_ref/occ/instm/NSTableColumn/dataCellForRow:" rel="nofollow noreferrer">-dataCellForRow:</a>. In a custom subclass, you could override this method and pass either its -dataCell for normal operation or some alternate cell type.</p> <p>I had an occasion to have a checkbox column representing "include" in an outline view that only appeared for children (non-root items). The root items couldn't be excluded, only their children, so it made sense only to show the checkbox for non-root items.</p> <p>I created a custom NSTableColumn subclass that took a delegate (my data source controller) and checked to see if it responded to the selector -deadCellColumn:shouldShowDeadCellForRow:. If it did, I called that method (which was implemented on my data source controller) to ask it if I should show a "dead cell" (a basic NSCell subclass that draws nothing) and swapped it according to the answer. If the delegate didn't respond to the selector, the table column returns its normal -dataCell.</p> <p>The custom cell (which I called "DeadCell") was needed here because I wanted to ensure nothing got drawn and nothing was editable. I'm not sure it was strictly necessary but I did it anyway. This isn't much use in your case, but I wanted to state it anyway for completeness.</p> <p>Your situation is a bit more complicated, especially because Bindings are involved (and different data cell types can have different bindings for their value -- popups can be especially challenging). In my case, I eschewed bindings for the tried-and-true data source mechanism. It simplified things greatly. :-) For your case, it's easy enough to swap cell types around using data source methods.</p>

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