Hi,
You can create a new Collection based on the ItemSource and pass it to CheckComboBox.SelectedItemsOverride ;
You can create a new Collection based on the ItemSource and pass it to CheckComboBox.SelectedItemsOverride ;
ObservableCollection<UserObject> newCollection = new ObservableCollection<UserObject>( myItemSourceList );
_combo.SelectedItemsOverride = newCollection ;