Hay Microsoft,  I am trying to implement an advanced BindingList, one
that supports adding and deleted rows while filtered.  I am having a
bear of a time making heads or tails of the rules for when EndNew() and
CancelNew() are called. I have gone ahead and written a test program to
see when they get called.  Here is what I am seeing:

the DataGridView starts with two lines and neither function has been
called.  As soon as I click on the new row, I get this:

EndNew(0)
EndNew(0)
AddNewCore()
InsertItem(2, )
EndNew(-1)
EndNew(0)

When I click on the second row (cancel the add) I get this:

CancelNew(2)
RemoveItem(2)
EndNew(2)

If I where to make changes and then click on the second row, to commit
the changes I get this:

EndNew(2)
EndNew(2)

My best guess is that the EndNew() should be ignored unless the index
is that of the last InsertItem().  My real question is:

Microsoft is there any offical documentation out there regarding what
the behavior is on this?

Sam Carleton