In the rowinitialize event I found some code that you wrote to format a cell a certain way depending on it's value.  It doesn't seem to change the format no matter what I do.  I've set the useeditormasksettings to true but I'm not sure if that is applicable because I'm settign the format, not the mask.

e.Row.Cells["deriv_IV00102QtyOnHandStartLoc"].Column.UseEditorMaskSettings = true;

When I put in the line below setting it to a currency it works which means I'm not setting the format anywhere else by accident

e.Row.Cells["deriv_IV00102QtyOnHandStartLoc"].Column.Format = "c";

When I try the code you put up (i have the MyOwner class in there as well) the field is not formatted at all.

int x = 3;
MyOwner myOwner;
EditorWithText editor;
switch (x)
 {
  case 1:
   myOwner = new MyOwner("d4");
   break;
  case 2:
   myOwner = new MyOwner("e");
   break;
  case 3:
  default:
   myOwner = new MyOwner("c");
   break;
 }
editor = new EditorWithText(myOwner);
e.Row.Cells["deriv_IV00102QtyOnHandStartLoc"].Editor = editor;

Then in another class file I have:

    public class MyOwner : Infragistics.Win.UltraWinEditors.DefaultEditorOwner
    {
        private string format;
        public MyOwner(string format)
        {
            this.format = format;
        }

        public override void GetFormatInfo(object ownerContext, out string format, out IFormatProvider provider)
        {
            base.GetFormatInfo(ownerContext, out format, out provider);
            format = this.format;
        }
    }

What am I missing so that the format of the cell is a certain way when the user is viewing the grid (not editing - I've got editing to work)? 

Once I get this working what I will do next is change each individual value's decimal places depending on what the user has said the particular item's decimal places should show.