>>Form has parent and child grid controls, e.q. document and document rows.
>>When child grid is active, it is desirable that current row in parent
>>grid is distinguishable from others.

Did you know that there is a default property of grids that will show or hide a column that contains a current row pointer, which is always visible whether the grid currently has focus or not. This would be the simplest way, since it's already built in! No coding required! :)

Dana