Data environment Designer

I am using Vb 6 and sql server. i want to use data environment. in sql
server i have a stored procedure with parameters. in a data environment
after setting connection then i added a command object and in the properties
i set evrything for the general tab i mean database object (stored
procedure),object name (Stored Procedure name),connection (connection object
name). but i don't see anything parameters in the parameters tab. it is
blank. everything in the parameters tab is disabled. how can i customise
parameter objects?

Thanks in advance.

Hima