Duncan,

this does the trick, I'm seeing the expected value in the grid now.
Just one issue (May be related to what I'm doing in the form):
When I redisplay the grid contents (based on user selecting a different parent record) I am getting an error

System.Reflection.TargetInvocationException: Property accessor 'Title' on object 'Business.MilestoneEntity' threw the following exception:'This row has been removed from a table and does not have any data.  BeginEdit() will allow creation of new data in this row.' ---> System.Data.RowNotInTableException: This row has been removed from a table and does not have any data.  BeginEdit() will allow creation of new data in this row.

   at System.Data.DataRow.GetDefaultRecord()
   at System.Data.DataRow.get_Item(String columnName)
   at Business.MilestoneEntity.get_Title()

I am running code like this:

this.oMilestone.GetMilestonesByProjectID(id);
this.mmDataGridView1.DataSource = this.oMilestone.CreateEntityList();

I guess I am doing something incorrectly in reassigning the datasource, any clues?