>>How can you determine what records are visible?
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>The only way I have found is to use a sort of Dynamicxxx(). Best is DynamicFontShadow()
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>Have at least one column with
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>  .DynamicFontShadow = [m.this.UpdateCollection(recno())]   && or record pk instead of recno()
>

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>Add a grid method: UpdateCollection(id)
>Add a Collection to the grid
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>
>Now, each time UpdateCollection is called, you can test whether the id is in the collection (empty(collection.getkey(transf(m.id)))
>If it is not in add it
>.Collection.add(m.id, trans(m.id))
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>Each time the grid is refresh() or scrolled, the DynamicFontShadow will fire and you can add the Id's to the collection
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>The DynamicXXX fire from left to right, top to bottom. The first one added will be the top visible row of the grid
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>The key is to know when to clear the collection
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>(1) Do a bindevent on grid.Refresh - the delegate must be called before the refresh - clear the collection. The refresh will refill it
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>(2) Do a bindevent on scrolled - delegate must be called after scrolled
> if the direction was vertical, clear the collection, call grid.RefillCollection ( see below)
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>(3) Do a bindevent on Resize - delegate must be called after scrolled
> clear the collection, call grid.RefillCollection ( see below)
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>
>Add a property to the grid: HeightDelta, value 1
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>RefillCollection forces the dynamicXXX to be re-evaluated for the visible cells in a grid
>

>
>&& Grid.RefillCollection 
>store -m.this.HeightDelta to this.HeightDelta
>this.height = m.this.Height + m.this.HeightDelta
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>
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>same principle - download#37149


Thanks. That very detailed solution helped immensely.