>I have a grid that is populated by the line items of an invoice. If I move the record pointer to a new invoice, how can I refresh the grid. thisform.grd.refresh() doesn't seem to work.

I haven't read through every reply, but often you need to Setfocus to the grid to update the pointer, particularly when using tables and cursors.

grid.setfocus
this.setfocus 

will update grid but not move the focus from wherever you are.