Can't insert new row in last position in row set

I am trying to programmatically insert a new row into the last slot of a View Object's default row set.
I normally can do this:
Row newRow = vo.createRow();
// set stuff on the row
vo.last();
vo.next();
vo.insert(newRow);and, voila, the row is in the last position.
But on this particualr view object, when I do the above, the row is inserted in the first slot.
There doesn't seem to be anything unusual about the View object. it is a child Vo in the data model, but that shouldn't matter.
When I debug with vo.getCurrentRowSlot(), even after performing last(); next();, vo.getCurrentRowSlot() returns 0, never 3.
Has anyone else run into this behavior and if so, any resolution or explanation?
FYI, I was able to use the following workaround:
Row lastRow = vo.last();
if (lastRow != null){
    int indx = vo.getRangeIndexOf(lastRow) + 1;
    vo.insertRowAtRangeIndex(indx, newRow);
} else {
   vo.insertRow(newRow);
}   

would this solve your problem
http://kohlivikram.blogspot.com/2008/10/add-new-row-in-adf-table-on-button.html

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