table header cells not on even lines

[Shane]

I've got an NSTableColumn that uses a custom class for the table
header cells which is inherited from an NSPopUpButtonCell. I list the
code below how I create the table header cells and put them in the
NSTableColumn's.
Attached are two images that show what my problem looks like. The
'cell-before' attachment shows what my table header looks like before
I replace the cells with my own DataTableHeaderCell class (which is
below). The 'cell-after' image is what it looks like after I've
replaced the header cells w/ my DataTableHeaderCell class. In the
'cell-after' image, you can see that the table header cell is all
white and even extends slightly into the gray area (which is an
NSPathControl), and it's not a smooth line as shown i the
'cell-before' image. That's the problem I'm trying to fix.

Here is how I create my table header cells, which, when run causes the
'cell-after' image problem. This is not run in the 'cell-before'
image.

        for (i = 0; i < [columnItems count]; i++) {
                NSString *columnName = [columnItems objectAtIndex:i];
                
                tableHeaderCell = [[DataTableHeaderCell alloc] 
initTextCell:columnName];
                [tableHeaderCell setPullsDown:NO];
                [tableHeaderCell setControlSize:NSMiniControlSize];
                [tableHeaderCell setBordered:NO];
                [tableHeaderCell setFont:[NSFont labelFontOfSize:
                        [NSFont smallSystemFontSize]]];

                column = [[DataTableColumn alloc]
                        initWithIdentifier:[NSNumber numberWithInt:i]];
                
                if (i == 0) {
                        [tableHeaderCell setEditable:NO];
                        [column setWidth:40];
                }
                else {
                        [tableHeaderCell setEditable:YES];      
                        [tableHeaderCell addItemWithTitle:@"col A"];
                        [tableHeaderCell addItemWithTitle:@"col B"];
                        [tableHeaderCell addItemWithTitle:@"col C"];
                }
                
                [column setHeaderCell:tableHeaderCell];


------- DataTableHeaderCell.h
@interface DataTableHeaderCell : NSPopUpButtonCell
{

}

- (id) initTextCell:(NSString *) string;
- (void) drawInteriorWithFrame:(NSRect) cellFrame inView:(NSView *) controlView;

@end

------- DataTableHeaderCell.m
@implementation DataTableHeaderCell

- (id) initTextCell:(NSString *) string
{
        self = [super initTextCell:string];
        
        if (!self) {
                return nil;
        }
        
        return self;
}

// This mostly just draws a bottom border on the cell.
- (void) drawInteriorWithFrame:(NSRect) cellFrame inView:(NSView *) controlView
{
        [[NSColor whiteColor] set];
        [[NSBezierPath bezierPathWithRect:cellFrame] fill];     
        
        NSBezierPath *path = [NSBezierPath bezierPath];
        
        [path moveToPoint:NSMakePoint(cellFrame.origin.x, 
cellFrame.size.height)];
        [path lineToPoint:NSMakePoint(NSMaxX(cellFrame), NSMaxY(cellFrame))];
        
        [[NSColor darkGrayColor] setStroke];
        
        [path stroke];
        
        [super drawInteriorWithFrame:cellFrame inView:controlView];

        return;
}

@end

<<attachment: cell-before.tiff>>

<<attachment: cell-after.tiff>>

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