How can i get a combobox on the report parameter?

[ADM-IT Denis Pujdak]

I have parameters:
Reporting-Parameters-Combobox01.png

Also I receive it
Reporting-Parameters-Combobox02.png

Reporting viersion is 6.2.13.110. and VS2010 SP1
How can i get a combobox?

[ADM-IT Denis Pujdak]

thanks. I found a problem.

my sqlDataSourceServices the nonexistent parameter had and didn't work. 
now I understand that ComboBox display depends on serviceable data source.