This is a problem I discovered but may not be caused by ES. However I post it here just in case! 

Problem: Combo not keeping track with grid

Sample data: Northwind Orders and Employees using a binding source.

Grid: Orders
Combo: Employees

If I use standard MS controls with a DataSet it works as expected

Private Sub MS_LoadDataSetData() 

' Use standars VS 2005 controls Only 


Dim cnString As String = "Integrated Security=SSPI;Initial Catalog=Northwind;Data Source=xxxxxx" 

Dim sqlOrders As String = "SELECT OrderDate, ShipName, EmployeeID FROM Orders" 
Dim sqlEmployees As String = "SELECT FirstName, LastName, EmployeeID FROM Employees" 

Dim ds As New DataSet("Northwind") 
Dim daOrders As New SqlDataAdapter(sqlOrders, cnString) 
Dim daEmployees As New SqlDataAdapter(sqlEmployees, cnString) 

daOrders.Fill(ds, "Orders") 
daEmployees.Fill(ds, "Employees") 

bsOrders.DataSource = ds.Tables("Orders") 
bsEmployees.DataSource = ds.Tables("Employees") 


With Me.DataGridView1 
    .DataSource = bsOrders 
End With 

With Me.ComboBox2 
    .DataSource = bsEmployees 
    .DisplayMember = "LastName" 
    .ValueMember = "EmployeeID" 

    .DataBindings.Clear() 
    .DataBindings.Add(New System.Windows.Forms.Binding("SelectedValue", bsOrders, "EmployeeID", True)) 
End With 

End Sub 

If I use Component One controls with a DataSet it works as expected

Private Sub C1_LoadDataSetData() 

' Use C1 controls and if checkbox checked 
' use MS ComboBox 


Dim cnString As String = "Integrated Security=SSPI;Initial Catalog=Northwind;Data Source=xxxxxx" 

Dim sqlOrders As String = "SELECT OrderDate, ShipName, EmployeeID FROM Orders" 
Dim sqlEmployees As String = "SELECT FirstName, LastName, EmployeeID FROM Employees" 

Dim ds As New DataSet("Northwind") 
Dim daOrders As New SqlDataAdapter(sqlOrders, cnString) 
Dim daEmployees As New SqlDataAdapter(sqlEmployees, cnString) 

daOrders.Fill(ds, "Orders") 
daEmployees.Fill(ds, "Employees") 

bsOrders.DataSource = ds.Tables("Orders") 
With Me.C1TrueDBGrid1 
    .DataSource = bsOrders 
    .Rebind(False) 
End With 

bsEmployees.DataSource = ds.Tables("Employees") 
With Me.C1Combo1 
    .DataSource = bsEmployees 
    .DisplayMember = "LastName" 
    .ValueMember = "EmployeeID" 

    .DataBindings.Clear() 
    .DataBindings.Add(New System.Windows.Forms.Binding("SelectedValue", bsOrders, "EmployeeID", True)) 

    .AutoCompletion = True 
    .AutoDropDown = True 
    .AutoSelect = True 

    .MatchEntry = C1.Win.C1List.MatchEntryEnum.Extended 

End With 

End Sub 

The problem arises if my datasource is an EntitySpaces Collection. With standard MS controls it works as expected. However if I use C1 controls the C1Combo fails to keep pace with the EmployeeID in the C1TrueDBGrid. If I then add a standard MS ComboBox to the form and bind it to the employees then the C1 ComboBox keeps track .

With Me.C1Combo1 
    .DataSource = bsEmployees 
    .DisplayMember = "LastName" 
    .ValueMember = "EmployeeID" 

    .DataBindings.Clear() 
    .DataBindings.Add(New System.Windows.Forms.Binding("SelectedValue", bsOrders, "EmployeeID", True)) 

    .AutoCompletion = True 
    .AutoDropDown = True 
    .AutoSelect = True 

    .MatchEntry = C1.Win.C1List.MatchEntryEnum.Extended 

End With 

With Me.ComboBox1 
    .DataSource = bsEmployees 
    .DisplayMember = "LastName" 
    .ValueMember = "EmployeeID" 

    .DataBindings.Clear() 
    .DataBindings.Add(New System.Windows.Forms.Binding("SelectedValue", bsOrders, "EmployeeID", True)) 
End With 

It seems the only way I can get the C1ComboBox to keep track of the grid is to add a standard combo in "parallel" to the C1ComboBox.