All selection in Reporting Services

I am looking for some help with reporting services.
I have a drop down menu with the list of products populated from a
table. And I want a n 'All' selection so that all the product
information is retreived. I am aware that I cannot pass array of
parameters to the stored proc.
Is there a way out,
Looks like this
'Product'
TV
Camcorder
Digital Camera
ALL
and 'ALL' is where it should select TV, Camcorder and Digital Camera.If you search this group for "all parameter", you'll find many viable
solutions. Almost too many.
For the most straight forward explanation I've seen, check this post in
Chris Hays' blog:
http://blogs.msdn.com/chrishays/archive/2004/07/27.aspx
HTH
toolman