带有列表框的WPF列表框——UI虚拟化和滚动

My prototype displays "documents" that contain "pages" that are represented by thumbnail images. Each document can have any number of pages. For example, there might be 1000 documents with 5 pages each, or 5 documents with 1000 pages each, or somewhere inbetween. Documents do not contain other documents. In my xaml markup I have a My prototype displays "documents" that contain