Want to remove option from the parameter dropdown in SSRS 2008 report

Hello,

For one of the parameters in SSRS 2008 report, I have <ALL> in the drop down list because the list is too big and (Select All) was not able to process it. So the dataset looks like this:

SELECT '<ALL>' AS Item
UNION
SELECT DISTINCT Item
FROM  Table1

In the report, how to remove (Select All) from the drop down list? I looked at several solutions, but none of them worked for me. One of the solutions suggested to use default values and that didn't work. Please help.

Thanks.