ACROBAT 9.2.0 plugin - Embedded PDF Toolbar Issue

Issue:
Developping an Acrobat 9.2.0 plugin used within Internet Explorer, I faced this issue:
The "Task Toolbar" was not visible anymore when Acrobat was launched as an external window (Embedded within Internet Explorer for instance...)

Reason :
A registry KEY/DWORD value was missing in the HKCU

Solution:
Add
HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat\9.0\Annots\cPrefs\bshowAnnotToolsWhenNoCollab
DWORD value.
Set its value to 1