MVVM relocating components with ViewModels

problems with nested "binder" when detaching/re-attaching component containing a nested ViewModel/Binder

the attached case has issues in both ZK7 and ZK8 (with slightly different outcome) when the <div id="detail"/> is relocated in the component tree un/wrapped in a decorating div.

open simple.zul:

"some command" button works and initiates a command on the InnerViewModel
click the button to remove the decorator (1. remove ...)
-> "some command" button still works correctly
click the button to wrap the include in the the decorator again (2. wrap ...)
-> ZK8 the "some command" does not fire anymore
-> ZK7 the "some command" fires to the OuterViewModel

in the server logs the component attributes of the detail include are logged, when the problem occurs important bind attributes are suddenly missing.