Trying to setup VCR style button to navigate the records on a MM.NET WinForm.
The following code is after the WinForm InitializeComponent() and after the retrieval of business objects via Me.oBusinessObject.GetAllBusinessObjects():

        ' We want to handle position changing events for the DATA VCR Panel
        ' Position is managed by the Form's BindingContext so hook the position changed
        ' event on the BindingContext
        AddHandler Me.BindingContext(oVisitorType).PositionChanged, AddressOf VisitorType_PositionChanged

        ' Set up the initial text for the DATA VCR Panel
        VisitorTypePositionDisplay.Text = String.Format("Record {0} of {1}", (Me.BindingContext(oVisitorType).Position + 1), Me.oVisitorType.GetCurrentDataSet.Tables("VisitorType").Rows.Count)

The section that sets the initial text for the DATA VCR Panel throws an exception:
Object reference not set to an instance of an object.

Is there a way to correct this? Is there a better way to accomplish this?