The following query will list all user defined stored procs (including their parameters and parameter types) in your default database:
SELECT
sp.name,
p.name AS Parameter,
t.name AS [Type]
FROM
sys.procedures sp
LEFT JOIN sys.parameters p
ON sp.object_id = p.object_id
LEFT JOIN sys.types t
ON p.system_type_id = t.system_type_id
WHERE
is_ms_shipped = 0
ORDER BY
sp.name
Put that into an ADOQuery object and set it to Active. (Updated answer with LEFT JOINS so that it includes SPs without parameters).
solved List of stored procedures inside a database