Problems in saving NSView with subviews to PDF

Question

I have an NSView with NSImage instances as subviews that all show up correctly on the screen. I want to save them to a PDF file but the subviews are not included.

The routine works well and also saves to PDF. The resulting PDF file contains all that I draw on the NSView, but the NSImage-subviews are only visible on screen but not in the PDF file. Any suggestions?

NSString* savePath = [self getSavePath];

if (savePath != nil) {
    
    NSData *pdfData = [_myCtDistView dataWithPDFInsideRect:_myCtDistView.bounds];

    if ([pdfData writeToFile:savePath atomically:YES]) {        
        NSLog(@"Saved PDF successfully");        
    } else {        
        NSLog(@"Saved PDF failed");
    }
}

View drawing code:

- (void)drawRect:(NSRect)dirtyRect {
    [super drawRect:dirtyRect];
        
    [[NSColor whiteColor] set];
    NSRectFill(self.bounds);

    [self drawBgImage];

}//end of drawRect   

- (void)drawBgImage {
   
    NSImageView *backgroundImageView = [[NSImageView alloc] initWithFrame:self.bounds];
    backgroundImageView.image = _bgImage;
    backgroundImageView.imageScaling = NSImageScaleProportionallyUpOrDown;

   [self addSubview:backgroundImageView];

}// end of drawBgImage