Datagridview issue with CurrentRow.Index not having been established

I have this piece of code included on a tabpage that I originally had set with .SelectionChanged, but it would error when the rowheader was clicked.  My issue is that the CurrentRow.Index is not set when I click outside an actual row.  The code below, I realize now with RowEnter,  has not initialized CurrentRow.Index.

What can I modify about this code where if a row becomes active in any certain way (clicked, coded, etc.) and also if headers are clicked that I can handle CurrentRow.Index.  Do I just need to create an error handler with some 'ignore' code.  I'm skeptical about that because of my 'PopulateParticipants' Sub where data is drawn from a dataview.

Thanks in advance!

Private Sub grdviewParticipants_RowChg(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles grdviewParticipants.RowEnter
        If Activating Then Exit Sub
        Activating = True
        If dvParticipants.Count > 0 Then
            If grdviewParticipants.CurrentRow.Index >= 0 Then
                grdviewParticipants.CurrentCell = grdviewParticipants.Item(3, grdviewParticipants.CurrentRow.Index)
                glCurrentParticipantRow = grdviewParticipants.CurrentRow.Index
                glParticipant = dvParticipants(grdviewParticipants.CurrentRow.Index)("participant_id").ToString
                PopulateParticipants()
            End If
        End If
        Activating = False
    End Sub

Select allOpen in new window