freeze product category when editing product

[magicf]

Hi,
I select a category to list all of its product because I'd like to edit the products. After I click Save&Close button after editing the product the category selection reseting to the defualt. It would be nice to keep the category selection becasue it's annoying to select the category every time I edited a product but I'd like to edit more from that category.
How can I do that?
Thanks.