Github user pzahra commented on the issue:
https://github.com/apache/flex-sdk/pull/46
Sure, I deleted that particular sandbox a while ago but I can describe it.
Start with the old s:DataGrid, give it a dataset large enough to give it a nice
long pair of scrollbars. Now set a couple of rows and columns to be locked (one
column and three rows, I used). You'll need to provide a custom cell renderer
like we had that sets its own background using the "selected" state instead of
letting the control background show through (we were using this because some
cells needed to be different colours and still indicate when they were
selected). Run that and select some random cells. Notice that inside the main
scrollable area the highlight is offset by the number of rows that are locked
(not columns). If you have a second dataset that is smaller, switching to that
while the data is scrolled all the way will also misalign the panes.
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