Hi!
I have found an unexpected tab rearrange on DragDrop event.
For example:
Put TAdvOfficePager on form and then put TTreeView with some nodes.
Set DragMode for TTreeView to dmAutomatic.
TAdvOfficePager.TabReorder property stay False.
Add TAdvOfficePager.OnDragOver event and set Accept to True.
In the result if I drop any acceptable object to inactive tab then the active tab reordered to cursor position.
We implemented a fix for this issue. Next update will have this fix.