How Make MDX Query Return Something Rather Than Nothing?

Hi


I have encountered some problems creating MDX query.
There are two input parameters on report, both dropdown list and from query.
The first parameter will check "State", and the second parameter "Store Name" depends on previous' result.
If there's no "State" found, I manage to show a "No Data" in the "State" droplist.
But with "No Data" in first parameter, the second parameter simply is not enabled.
I want the second parameter shows " No Data" as well but not succeed.


Here's code

...

SELECT {[Measures].[A1], [Measures].[B1], [Measures].[C1]} ON COLUMNS ,

[Store].[Store Name].ALLMEMBERS ON ROWS
FROM ( SELECT ( STRTOSET(@State) ) ON COLUMNS FROM [Cube])
...
The query need to look at dataset that contains [store name] on rows, and some measures on columns.
It also restricted by parameter @State.

Store Name that satisfies @State will be displayed.
But if nothing from SELECT ( STRTOSET(@State) ) ON COLUMNS FROM [Cube], there's nothing in result.
I'd rather like show something rather than nothing.
I try codes like
...
MEMBER [Store].[Store].[NA] AS '"N/A"'
IIF(<Parameter empty>,
(SELECT ... ON COLUMNS, [Store].[Store].[NA] ON ROWS FROM ...),
(SELECT ...<Original statement >)
)
...
It shows "Subselect support only Column axis".

Any one has an idea?
Please help me out
Many thanks!


Mr. L