title: in edit mode the cell is not transparent in mac app
body: <p>On a button click I am adding a new row to my tableView &amp; reloading the table view .My table has NSTextField Cell  &amp; I am using the below code</p>
  
  <pre><code>[tempArray addObject:@""];
  [tableView reloadData];
  [tableView editColumn:0 row:[tempArray count]-1 withEvent:nil select:YES];
  [tableView setNextResponder:self];
  
  -(void)tableView:(NSTableView *)tableView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)rowIndex
  {
      [cell setFocusRingType:NSFocusRingTypeNone];
      [cell setBackgroundColor:[NSColor clearColor]];
  
      if([[tableColumn identifier] isEqualToString:@"DataIdentifier"])
      {
          [cell setDrawsBackground:NO];
          [cell setTextColor:[NSColor grayColor]];
          [cell setFont:[NSFont fontWithName:appDelegate.selectedFont size:appDelegate.selectedFontSize]];  // somewhat like 16 on the pad    
      }
  }
  </code></pre>
  
  <p>What happens is now in edit mode my cell is not transparent.It has white background.Please help !</p>