I am having  a problem displaying fields in a Devex Grid. The only fields that will diplay, are the Original Fields from my Main Table BO

I want to select out different fields from a few joined Tables and display them in  Grid. For this purpose , I have set up a Dummy BO, with just two fields, and I use this as a sort of Repository to hold the fields I select out. So say my Dummy Table (And BuisnessObject) has just 2 fields D01_pk and D01_Val1.

The only purpose of the Dummy Table is to be able to join the fields and end up with one Table, but the only fields I can get to display are the fields from the original Source BO (In my case just 2 fields). All other fields just show blanks, even though the Business Object populated with the correct count of rows.

I have the following code in the Load of the form (I cannot assign the BBS to a business object on the form parameters as I have not yet created the BusinessObject, this is why I am setting the BusinessObject to the BBS in the Form Load)

Kernel_BOLibrary.XBO myBO = new XBO();        // My Dummy Business Object whcih I use to JOin other Tbales into
SqlCommand comm = new SqlCommand();
comm.CommandText = "Select 1 as D01_PK,'XXX' as D01_Val1,  MyField1,MyField2,MyField3 from TABL1 join TABL2 on X=Y ";
myBO.Clear();
myBO.FillDataTable(comm);
bbsPost.BusinessObject = myBO;
gridPost.DataSource = bbsPost;

So in the Grid, DO1_Pk and D01_Val1 display fine, but I cannot get the other fields, which I have joined (MyField1,MyField2,Myfield3) to display