The easiest way do tips, you can dynamically set style.Celltiptext in the QueryCellStyleInfo handler. Will this do what you need?
private void gridGroupingControl1_QueryCellStyleInfo(object sender, GridTableCellStyleInfoEventArgs e)
{
if(e.TableCellIdentity.TableCellType == GridTableCellType.RecordFieldCell
|| e.TableCellIdentity.TableCellType == GridTableCellType.AlternateRecordFieldCell)
{
GridRecordRow grr = e.TableCellIdentity.DisplayElement as GridRecordRow;
if(grr != null)
{
e.Style.CellTipText = grr.ParentRecord.GetValue("Description").ToString();
}
}
//or just setting e.Style.CellTipText = e.TableCellIdentity.Info is informative as well
}