I think this should get some attention. I’m currently working around this oversight right now This looks to be a showstopper for ActiveRecord, ARGen and Web 2.0; but please take a look at and comment on the ticket 
<https://xojo.com/issue/61644>
Currently, if you use WebListbox.RowTag when the WebListbox is set up to use a DataSource, you get an UnsupportedOperationException.
It would be nice to be able to store a RowTag in the WebListBoxRowData returned from the RowData function.
WebListbox could add a function to get the WebListBoxRowData for a row (preferable), or WebListbox.RowTagAt could return the tag stored in the WebListBoxRowData (easy to use).
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What about an array of Variants tied to the WebListBox:
Add an entry when you add a Row to the WebListBox:,
Read the Array(RowAt) at need time.
Workaround until it will be implemented ?
That probably won’t work. When users click on a header to sort rows on the browser, that array will suddenly be in the wrong order.
Thanks for the suggestion. I had tried a method similar to that, but even if I update the order with SortedPrimaryKeys the SelectedRowIndex is relative to what data is loaded, not all rows. The keys got misaligned very easily with a fast scroll.
If that’s so, please get a bug report in ASAP so we can fix it in 1.1.
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It is not possible to replicate the Sort in the Array the same as in the WebListBox ?
Remember: just a positive suggestion. It may be wrong.