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The NSTokenFieldDelegate marks all the delegate methods as abstract, forcing you to implement all of them. E.g.:
public abstract string GetCompletionStrings(NSTokenField tokenField, string substring, int tokenIndex, int selectedIndex);
This is in contrast, to, say, the NSSplitViewDelegate, which marks the delegate as virtual, thus enabling you to implement only those delegate methods that you need:
public virtual float SetMinCoordinateOfSubview(NSSplitView splitView, float proposedMinimumPosition, int subviewDividerIndex)
Addendum: furthermore, even when you implement all of the methods in the NSTokenFieldDelegate, they are never invoked, so it doesn't work at all.
Fixed the first part: dropped the abstract from the methods.
Do you know what version this fix will show up in? Xamarin Studio 4.0.8 (build 2) still has all the methods marked as abstract.
We do not have a date set, but it should be relatively soon.