forms problem

Hi Friends
I am having a problem related to the forms:

#1. I want to create a form which is having a field blob type.
#2. Say there is a table Temp having two fields (code varchar2 primary keyn
and mpeg4 blob).
#3. Now tell me how can I build a form which support BLOB datatype.

What I have done till now :

1.Insert few data in the table in the blob field using procedure
2. created a form
3.Now the problem is while querying, ,code is coming on the screen but the
blob field is not displaying can you help me so that i can retrive the blob
datatype fieled?

praveen