Unable to cast object of type 'MS.Internal.NamedObject' to custom type

Question

I am not new to WPF, but I can\'t figure out this problem:

I use an ObservableCollection that i bind to ComboBoxes, it\'s a

Answer 1

1. No need to call RaisePropertyChanged for MyObsCollection, because ObservableCollection internal implements INotifiyProperty Changed.
2. I think it is Crashing while assign the value(during set call), this will happen when you try to assign a collection of one type collection of another type. You have to create object of the MyCustomType and should be added to the MyObsCollection instead of directly assigning a collection of different type to MyObsCollection

It would be great if could post the entire code or piece of code where u assign the or add objects to MyObsCollection