I ran 'tableView:viewForTableColumn and it is always tableColumn == nil as I 
have just 1 column. I noticed that I never hit anything that is not 
"GroupCell". However this does not solve the grey background right?

Also I tried [ltableView setSelectionHighlightStyle:  
NSTableViewSelectionHighlightStyleSourceList];
It at least gets me the blue highlight colour. However there is some weird blue 
background now.
http://snag.gy/a1AC3.jpg is how it looks now. Still not a white background.

Regards,
Varun

From: Quincey Morris 
<quinceymor...@rivergatesoftware.com<mailto:quinceymor...@rivergatesoftware.com>>
Date: Friday, 2 May 2014 3:12 pm
To: Development 
<varun.chandramo...@wontok.com<mailto:varun.chandramo...@wontok.com>>
Cc: Cocoa dev <Cocoa-dev@lists.apple.com<mailto:Cocoa-dev@lists.apple.com>>
Subject: Re: Question on NSScrollView

On May 1, 2014, at 17:25 , Varun Chandramohan 
<varun.chandramo...@wontok.com<mailto:varun.chandramo...@wontok.com>> wrote:

Yes I have implemented tableView:isGroupRow.
- (BOOL)tableView:(NSTableView *)tableView isGroupRow:(NSInteger)row {
    DesktopEntity *entity = _tableContents[row];
    if ([entity isKindOfClass:[DesktopFolderEntity class]]) {
        return YES;
    }
    return NO;
}

What is wrong with this?

Nothing at all! Rows corresponding to a 'DesktopFolderEntity' are group rows, 
and all the others are not.

Also I implemented
- (NSView *)tableView:(NSTableView *)tableView 
viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
    DesktopEntity *entity = _tableContents[row];
    if ([entity isKindOfClass:[DesktopFolderEntity class]]) {
        NSTableCellView *groupCell = [tableView 
makeViewWithIdentifier:@"GroupCell" owner:self];
        [groupCell.textField setStringValue:entity.name];
        return groupCell;
    }
    return nil;
}

Are you saying I should not return nil here?

Well, you are returning nil for rows that aren't 'DesktopFolderEntity', which 
doesn't seem a good idea, but that isn't the issue you asked about.

In this code, you should return a view with identifier "GroupCell" - as you 
have done - for rows that are 'DesktopFolderEntity'. Since these are indeed 
group rows, this correctly gives them the group-row appearance (the one with 
the gray background).

That is, your table view is showing exactly what you asked it to show.

Your 'tableView:viewForTableColumn:' method is, however, missing some code. You 
need to return a view for non-group rows (that would probably be a view with 
identifier 'DataCell', if you have the default setup in IB), and you need to 
test tableColumn (and possibly tableColumn.identifier). ('tableColumn == nil' 
means that you're being asked for a group-row view. Otherwise you're being 
asked for a per-column view.)
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