I am trying to force my grid to only allow the user to select a single row at a time.  Which seems fairly straightforward, but I can't seem to find the right cocktail of properties to completely accomplish this.

I'm using Infragistics v3 2008 and I have the following code happening with a clean UltraGrid straight out of the toolbox.

The problem is when I click on a row, hold down the mouse button and drag it upwards or down.  I now have two rows selected, but I only want one.

How can I force this grid to only allow a single selected row on screen?

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim odt As New DataTable("Table")

        odt.Columns.Add(New DataColumn("Col1", GetType(String)))

        odt.Columns.Add(New DataColumn("Col2", GetType(String)))

        odt.Columns.Add(New DataColumn("Col3", GetType(String)))

        odt.Rows.Add("Happy", "Joy", "Joy")

        odt.Rows.Add("Happy", "Joy", "Joy")

        odt.Rows.Add("Happy", "Joy", "Joy")

        odt.Rows.Add("Happy", "Joy", "Joy")

        ug.DataSource = odt

    End Sub

    Private Sub ug_InitializeLayout(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs) Handles ug.InitializeLayout

        ug.DisplayLayout.Override.CellClickAction = Infragistics.Win.UltraWinGrid.CellClickAction.RowSelect

        ug.DisplayLayout.Override.SelectTypeRow = Infragistics.Win.UltraWinGrid.SelectType.Single

    End Sub

End Class