I have a table which my object is the delegate of. The table is bound to the array controller. The array of the array controller is filled with NSMutableDictionarys.

So I have

Here’s what I did:

- (void)tableViewSelectionDidChange:(NSNotification *)aNotification
{
	if([[[data objectAtIndex:[table selectedRow]] allKeys] count] == 0)
		[table editColumn:0 row:[table selectedRow] withEvent:nil select:YES];
}

First we become the delegate of the table and implement the tableViewSelectionDidChange: method which is sent after the selection is changed. Then we check if the object (an NSMutableDictionary) has any keys set. If no keys are set, we assume that the row is new. This is different than if the keys were set to empty strings. editColumn:row:withEvent:select: scrolls to the row and column and starts editing the cell.