disabling CTRL+ALT+DEL with custom GINA

Hi,

I know this has been asked lot of times in newsgroup and I tried lot of
things. We have a custom GINA modified from GINAStub. Now I do not want
any message to Pop up if user presses CTRL+ALT+DEL. Returning
WLX_SAS_ACTION_NONE in WlxLoggedOnSAS only prevents logoff / shut down
etc, but the message box showing all the options still comes.
I have not included the Task Manager component in the image also. Is
there any way to prevent the message box poping up?

Thanks for any help.
AK