Combo Boxes in Crystal Reports

[Mithun Verma]

Hello Everyone,
My Windows Application has Crystal Reports implemented in it. I have
added parameters to the Crystal Report. Also, I want to present the user
with a combo box on the Crystal Report where the user is shown default
values and he/she can select from it. How can I do this in Crystal
Reports.Also, how should this drop down box be populated with values
retrieved from my database?

I need the answers urgently.

Regards,
Mithun