On Jul 14, 2012, at 10:08 , Keary Suska wrote:

> For the archives, it is not safe to assume that tableView:isGroupRow: will 
> determine which rows are actually group rows, at least if you implement 
> tableView:dataCellForTableColumn:row:. It seems that regardless of whether 
> you implement tableView:isGroupRow:, NSTableView will always send 
> tableView:dataCellForTableColumn:row: a nil tablecolumn argument to determine 
> whether the row is a group row (ostensibly). If you return an NSCell object, 
> it will assume that the row is a group row and as a consequence will assume 
> that *every* row is a group row unless the row returns nil.

A group row is one drawn with with different style characteristics. (In a 
normal table, for example, it has a gradient shaded background.) This is 
controlled by 'tableView:isGroupRow:'.

A group cell is one that draws the *entire row* as a single cell (and cells are 
not drawn per column). This is controlled by 
'tableView:dataCellForTableColumn:nil row:'.

The two things are orthogonal, although in many cases you'll want the the group 
row to use a group cell to span the width of the table. One case where you 
might use a group cell *not* in a group row is in an outline view, where 
expandable rows might not need to show column information like detail rows.

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