>>I need to close and reopen the data source (a cursor) for a grid without adversely affecting the grid.
>

Thisform.grid1.RecordSource = SPACE(0)
>* Create/recreate cursor
>...
>Thisform.grid1.RecordSource = "mycursor"

>Thanks for the quick response.
>
>When the cursor is refreshed, the grid is now showing all columns instead
>of a subset.

You've to set recordsource of the grid to the empty string before you do anything to a cursor.