Dim ds As New DataSet
        Dim col_select As New DataGridViewCheckBoxColumn()
 
        With col_select
            .Name = "Selecione"
            .DefaultCellStyle.BackColor = Color.AliceBlue
        End With
 
        orden = "Select descripcion from signos"
        ds.Tables.Add("signos")
        Dim adaptador As New OleDb.OleDbDataAdapter(orden, bd)
        adaptador.Fill(ds.Tables("signos"))
        ds.Tables(0).Columns(1).ColumnName = "Descripcion"
        DataGridView1.DataSource = ds_signos.Tables("signos")
        DataGridView1.Columns.Add(col_select) ' añado al datagridview