Blocking task during vApp Instantiate

Hello Everyone,

We are currently calling the instantiate VAPP from the vCloud API and we want to do a blocking task before vApp Deploy so we can execute some scripts to modify the VMs before they power on so then once the scripts execute then power on the VAPP.

I thought the "Start vApp (Deploy from API)" would block during the instantiate but it does not. Am I missing something to get the blocking task to execute at Start vApp???

Thanks!!!

Gary B.