//Event subscription
this.sfDataGrid1.ToolTipOpening += SfDataGrid1_ToolTipOpening;

//Event customization
private void SfDataGrid1_ToolTipOpening(object sender, ToolTipOpeningEventArgs e)
{
    var record = e.Record as OrderInfo;

    e.ToolTipInfo.Items.AddRange(new ToolTipItem[] { toolTipItem1, toolTipItem2 });

    var recordIndex = this.sfDataGrid1.TableControl.ResolveToRowIndex(record);

    if (e.RowIndex == recordIndex)
    {
        if (record.CustomerID == "FRANS")
        {
          e.ToolTipInfo.Items[1].Text = "FRANS";                        
          e.ToolTipInfo.Items[0].Image = Image.FromFile(@"../../Images/FRANS.png");
          }
    }
}