Are there a finite number of values in Store? If so you should be able to adapt the attached code.
This uses standard HTML code to flip between different pages (page one and two are two tabs on the same dashboard, the third is elsewhere). You will see in frame one and two there is a select parameter. I have a listbox called TRIGGER that is being selected (in order to fire an Action on page change). You will need to create a listbox for Store and have a 'frame' for each store entry.
If there are a large number of Stores, or the there is the potential for the list to expand you may need to use another approach - but this should point you in the correct direction.