I have a BO on my form which uses a few other BOs to get property and the like.  I would like to have properties on my primary BO which point to properties on the secondary BO.  For example if I have a secondary BO called Clients which is linked by the ClientKey on the primary/seconday BO, and want to get the Client Description I would have a property like this:

Public ReadOnly Property ClientDescription as String
  Get
    Return Clients.Description
  End Get
End Property

The question I have is how I keep Clients looking at the right record when I am navigating around in the primary BO.  I fill the Clients BO with all clients in the Fill of the primary BO and I have some code in the Navigated and CurrentDataTableRefilled event handlers to navigate Clients to the correct primary key when the primary BO record changes.  

My problem is that when I get into the Navigated event my Clients.Count is 0.  When it starts the Fill method the Client count is a few hundred, but it clears it out somewhere along the way.  Any idea what I am doing wrong here, or if there is a better way of doing what I'm trying to accomplish?  I can't really use the parent/child relationship here because it doesn't make sense in other areas of the database/code.

The CurrentDataTable.Rows.Count corresponds to Clients.Count....both are correct when in the PrimaryBO_CurrentDataTableRefilled handler, but when it gets to the PrimaryBO_Navigating event handler, the counts are zero and there is not a Filter set, it is "". 

I looked at the BusinessLayer code here and there wasn't much going on between these events that I could see.  I also don't handle any events for Clients and it is a private object so it's not messed with anywhere else either.  I will continue looking, but I can't see anywhere I am filtering the rows or refilling the table. 

Hrm... you could try putting a handler on the CurrentDataTableRefilled event of the child business object and put a break point in it.  Then look at the CallStack window and see what called the refill further up the line.