Jason,

I tried adding the tablename to the BindingSourceDisplayMember and BindingSourceValueMember and it didn't make any difference. Then I removed the old drop down list, moved the list using the 1st table to be the first control and made a copy of the 1st control to create the 2nd. That did not solve the problem either. Do I need to do something to register the 2nd table with the form?

Here is the code I used to create the reader:

        public IDataReader ReadApprovers()
        {
            IDataReader dr = this.DataSet.CreateDataReader(this.DataSet.Tables[1]);
            return dr;
        }

Thanks.

Linda

[UPDATE]

I stepped through the binding code. This may be the problem. mmBusinessWebPage.cs has a method called GetBizObj, which calls RefBizObj, passing the name of the 2nd table ("Approvers") as the parameter. It calls
an mmCollections.cs method Get(string ObjClass). If the ObjectType ("Users", which is the primary table) does not equal the ObjClass ("Approvers", which is the 2nd table), it returns a null.

That seems like it is ending up with a null object reference for data binding. I still don't know what to do to fix this, though. It seems like I probably need to register something else with the form. I tried registering another instance of the business object Users but that caused both drop down lists to have no values.

I hope you've still got some more ideas.

Thanks.

Linda