If you attempt to call GridElement.getRow() on a row that's not currently being shown in grid's viewport, you'll get null. The problem is that the function doesn't mention this at all in the javadoc.

The solution would be either:

1. To mention explicitly that a null value can be returned when the rowIndex is outside of getFirstVisibleRowIndex()/getLastVisibleRowIndex() or isRowInView()
2. Or use scrollToRow() to make sure the result value is never null.

Also document what the function will return if the index is out of bounds (e.g. -1 or rowCount+1)