Uninstaller does not reboot if run from installer

[cowwoc]

My installer code runs the uninstaller (in .onInit) if it detects the software is already installed. Once the software finishes uninstalling, it continues with the installation.

I am using "Delete /REBOOTOK" to delete files in my uninstaller. If one of the files cannot be deleted, it asks the user to reboot the system.

1. If I intentionally lock a file, run the uninstaller directly, and the user agrees to reboot the system *does* reboot.

2. If I do the same, but launch the uninstaller from inside the installer, it does *not* reboot.

The installer is invoking the uninstaller using this code:

code:
ExecWait '$0 _?=$INSTDIR' ;Do not copy the uninstaller to a temp file

Why isn't the uninstaller rebooting?

Thanks,
Gili