Checkboxes not selectable

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VB

Hello All, I have added a checkbox column to my datagrid, unfortunately, the checkboxes are not selectable. What am I missing? TIA

Private Sub chkBoxAll_Approve(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkButton.Click
        Dim ctr As New DataGridViewRow

        Try
            For Each ctr In dgvRequests.SelectedRows

                If chkBoxColumn.Selected = True Then
                    Exit For
                ElseIf dgvRequests.CurrentRow.Cells("requestType").Value = "OOORequest" Then
                    Call updateOutOfOffice(LeaveStatus.Approved)
                Else
                    Call updateRequest(LeaveStatus.Approved)
                End If
            Next
        Catch ex As System.Exception
            MessageBox.Show(ex.Message)

        End Try

    End Sub

:sigh:

[Modified: fixed your pre tags]