I've seen a sample form containing a grid that is linked to a table but I
found that there is one column in the grid that has no corresponding fields
in the table but it is a column that shows a calculation of another 2
columns. The grid is linked to a table called invoice_item, ...

How to use Current row highlightning in a Grid together with Columns
DynamicBackColor so that the DynamicBackColor dominates also on the
active row?