Dynamic change of homescreen's softkey - Amiel jc

Hello,

I would like to change the softkey of my homescreen plugin. On
smartphone, this can be hardcoded in registry by setting HKCU/Software/
Microsoft/Home/Keys/112 or 113 for the left and right softkey. On i600
samsung smartphone (windows mobile 5.0), the "carousel" homescreen
plugin changes the right softkey without setting this registry key.
With Spy++, the only message received by the softkey windows is a
WM_PAINT when it is updated....

Has someone any idea to achieve this without using registry ?

Thanks a lot !
Jean-Christophe