Quote Originally Posted by Guett_31 View Post
QIdentityProxyModel is what I tried in the first place. It didn't work either.
It won't "work" because it is a transparent proxy. You need to subclass it and implement the functionality you need.

I'm not familiar whith proxi models. why do I need my own proxi?
Because you want to add an artificial item to an existing model without changing the original model itself.