I need to bind a XamGrid to a CompositeCollection containing different ViewModels (which actually have similar named properties).
Only the similar named columns are visible.

Showing ViewModels of the same type is no problem, but in the moment I add another viewmodel type, the Xamgrid crashes with an error message
starting like:

The object of type "AViewModel" cannot be casted to "BViewModel"

atSystem.Linq.Enumerable.<CastIterator>d__1`1.MoveNext()

atSystem.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()

atSystem.Linq.Enumerable.Count[TSource](IEnumerable`1 source)

at Infragistics.DataManager`1.ResolveCount()
...

Is it even possible to use different ViewModels as ItemsSource?
The rows need to be sortable as well.
There seems to be no example code where such scenario is achieved.
Somewhere in the forums, I read about the need of implementing IComparable on the viewmodels, but there seems to be no example code either.


Thanks and best regards,
Nils