I need to insert a tablix at the bottom of a page and then "grow" upwards, depending on the number of rows returned. Looks like SSRS assumes you only want a tablix to grow downwards, with the location options being TOP and LEFT, instead of including a BOTTOM option.
Is it possible to create an Expression for the location? The only workaround I have thought of so far is to create some kind of blank object above the tablix whose size would change depending on the tablix result set, and "push" the tablix down.