I added a button in a custom page where users will be allowed to add a contact. This button will just  call the standard contact page. The button does open up the contact page but does not put the values that I have assigned for the &def_account_id=' + accountId.

I have the following in my code:

        return new PageReference('/003/e?' +

                '&def_account_id=' + accountId +

                '&def_contact_id=' + contactId +

                '&' + clientIDRef + '=' + accountName);

What am I missing ?

How do I view the log of field changes when using Track Field History.

I have turned on Track Field History on my Custom Object.  I have selected what columns/fields I woud like to track.

I looked at this thread http://community.salesforce.com/t5/Visualforce-Development/How-to-Find-History-Tracking-or-Audit-Log/td-p/132600  on  how to add a related list to a page layout to view the history..  However when I go to edit my page layout there is not related list of field history?

Is the only way I can view field history by creating a report? I was really hoping this information would be available from the built in page layout that VF provides.  Or is this just a bug in Spring 10  that History tracking is not showing in the page layout.