How to pass the parameter to the Map

Hello All,

I am working on a report which has both tablix report and the map below it.

Tablix report is

ID    ComplexName    ComplexSite  

Just Below the tablix report I have a map showing the geographical location for the complex.

I have a parameter called complex name. I have 2 datasets one for the report and one for the parameter.Right now I have values for the parameter as

abcd

efgh

hirl

If I select the parameter complex name as abcd then I will get the summary information in the tablix report for that complex and map for that. Right now the query for the parameter is

select complexname from facilitycomplex

I wanted to include "All" value for the parameter so that If I select All I should get summary information for all the complexes and I should get only the tablix report but not the map. So the bottomline is How can I add "All" value to the query so that I can select that value for the complexname parameter and when I select All I should not see the map below the tablix, I should see only tablix with all the complexes summary information.

Please help.

Thanks