SCCM: automatical remove App-V package within a connection group

Hi,

Please see https://social.technet.microsoft.com/Forums/en-US/83ae85d7-3be0-41dc-99ec-bba4b47db9ea/remove-appv-package-but-appv-gui-says-in-use-even-after-reboot?forum=mdopappv

I need to (automatically) remove an App-V Office 2013 package which is part of a connection group. Therefore I add the pc's to a colection to which an uninstall is triggered. This connection group contains an Outlook plugin and Proofing tools. 
I tried to remove it powershell-based but it does not want to be removed. I probably need to remove the connection group first but howto do that (there is no option to do this within sccm)?

Please advise.
J.

Jan Hoedt