Infopath form refresh problem

[Babu]

Hi,
I have hosted the infopath form on MOSS. I have a set of dropdownlists. when
i select a value in one form, the other dropdown queries the database through
a webservice and gets filled. All this is implemented through managed code
using c#. When i run the form through infopath client, it works fine, but
when i browse it from sharepoint directly, though the second dropdown gets
filled, it does not show up unless i click on some button or show a hidden
section.
Is there any way to auto refresh, or refresh the form based on some activity.

 

[S.Y.M. Wong-A-Ton]

Did you set the first drop-down to always postback? Drop-Down List Box
Properties > Browser forms tab > Always postback setting