Try changing the filter in your tooltip to YEAR(Orderdate) as follows. This will cause the viz in tooltip to filter on the year instead of "All Fields"
<Sheet name="top10_YTD_products" maxwidth="600" maxheight="300" filter="<YEAR(Order Date)>">
Your reply gave me the YTD top10 regardless of what week I was in the year. That is, if I was in week 5 or week 49, the YTD top10 list was the same. Ideally, when I hover over week 5, it would give me top10 YTD sales from Week1-Week5 and when I hover over week 49, it would provide the YTD top10 for week1 thru week 49. Does that make sense. I want to see the top10 list change as I hover through the year.
The top10 list will be different in January compared to what it would be in December.
Oh, I see...I can't think of a solution for that off hand. Let's see if others have any ideas.