Please clarify, when you refer to a grid box, are you referring to a grid control or a cell with in the grid control? How many items are there and how many are being displayed in the grid?

It is a grid which displays multiple cells and row.

I have a grid box that I am displaying all the files in a directory. I can see that the program goes through all 308 files and do the modify for them all.

* Add to Grid:

Add 1 to FP-UXBRWS-GD-List-Num-Rows.

Modify FP-UXBRWS-GD-List-Screen RECORD-TO-ADD = FP-UXBRWS-GD-List-Record.

but when it redisplays the grid. I only see 254 or so. I might have counted it wrong.

* Redisplay Grid:

Modify FP-UXBRWS-GD-List-Screen MASS-UPDATE = 0. *

I don't work with grid's much so I hope this makes sense.

A grid's capacity is limited by available memory. The grid uses a sparse storage technique in which records with no data have no memory allocated for them. A grid may not have more than 99 columns. There are no other practical limits [2 giga records (2,147,483,647 records) and 2 GB text per record]. A single cell may contain no more than 32,766 bytes of text.

In your grid properties, have you set NUM-ROWS?  I was able to make a grid with over 400 rows.

yes my num-rows was set to 308.   maybe I just reached my memory limit.