I must be missing something fundamental...

I have your basic DataGridView with its DataBoundSource set to a
collection object that is subclassed from BindingList<T>.  Objects are
added to the BindingList<T> collection. With the debugger I can see
that the DataGridView.DataBoundSource shows a non-zero count, and the
objects present have correct data.  Unfortunately, when the object
data is accessed for display through the bound properties, the object
data is all default 0's and empty strings.  The correct number of rows
is displayed.  It's just all wrong data!

To debug further, I added a CellFormatting() event handler.  Whenever
it gets called, the
DataGridView.Rows[e.RowIndex].DataBoundItem is that same empty default
object instance.

FWIW: The objects are added to the DataBoundSource from another thread
going through an Invoke().  I don't see this as a real problem as the
objects are correctly shown browsing through the DataBoundSource with
the debugger.

I've added calls to SuspendBinding and ResumeBinding before and after
adding the object to the BindingList<T> collection without any effect.

The DataGridView is read-only, i.e.:

   DataGridView.AllowUserToAddRows = false;
   DataGridView.AllowUserToDeleteRows = false;

because I saw mention of an empty row AllowUserToAddRows is true.

I don't have a "copy constructor", but I do have ICloneable
implemented on the <T> class used to define the BindingList.  It never
gets called.

So where and why is there an empty object instance being used for
displaying each row?

Thank you,
Steve