Image from WebView dragged onto IKImageView

I have WebView where I load content of webarchive. In the same view I have IKImageView outlet. Image drag n drop from web view onto image view doesn't work for me.

What is weird, it works when I drag photo e.g. from iPhoto onto the same image view. Also, I can drag image from my web view onto NSScrollView (which creates a link to the image) and I can drag the same photo onto a new Mail message (created an image as expected).

IKImageView has "Supports Drag and Drop" enabled in the IB.

What am I missing here?

It turned out, that the best way to handle d'n'd in my case is via WebArchivePboardType. Then:

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
    NSPasteboard *pboard;
    NSDragOperation sourceDragMask;

    sourceDragMask = [sender draggingSourceOperationMask];
    pboard = [sender draggingPasteboard];

    // Create image data from webarchive stored in a pasteboard.    
    NSData *image = [pboard dataForType:WebArchivePboardType];
    WebArchive *webArchive = [[WebArchive alloc] initWithData:image];

    // Let's see what are we dragging.
    for (WebResource *subresource in [webArchive subresources])
    {
        NSString *mimeType = [subresource MIMEType];
        if ([mimeType hasPrefix:expectedMimeTypeStartsWith])
        {
            NSData *data = [subresource data];

            CFDataRef imgData = (CFDataRef)data;
            CGDataProviderRef imgDataProvider = CGDataProviderCreateWithCFData (imgData);

            CGImageRef image;

            if ([mimeType hasSuffix:@"png"])
            {
                image = CGImageCreateWithPNGDataProvider(imgDataProvider, NULL, true, kCGRenderingIntentDefault);   
            }
            else if ([mimeType hasSuffix:@"jpeg"])
            {
                image = CGImageCreateWithJPEGDataProvider(imgDataProvider, NULL, true, kCGRenderingIntentDefault);
            }

            [self setImage:image imageProperties:nil];
        }
    }
    return YES;
}