Allowing "empty" value in comboBox

I'm writing a query (that will be used for a comboBox in sql reporting
services) but the user should also be able to chosse an "empty" value in
case he/she wants to leave it blank. I was thinking of using a "Union" and
attach the empty value to my recordset, but there has to be a way in
client-side for this.
I tried "Allow blank value", but it doesn't work (I don't see a blank value
anywhere)
Also, is it possible to change the combobox so it's not read-only?
Thanks.You might try "Allow Null Value"
Mine works wirth Allow Blank Value.
"VMI" <VMI@.discussions.microsoft.com> wrote in message
news:92DD1EFB-FDD0-41FF-B559-EBC93DFEB8BA@.microsoft.com...
> I'm writing a query (that will be used for a comboBox in sql reporting
> services) but the user should also be able to chosse an "empty" value in
> case he/she wants to leave it blank. I was thinking of using a "Union"
> and
> attach the empty value to my recordset, but there has to be a way in
> client-side for this.
> I tried "Allow blank value", but it doesn't work (I don't see a blank
> value
> anywhere)
> Also, is it possible to change the combobox so it's not read-only?
> Thanks.