ObservableCollection not updating View

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You need to raise the change notification on the Level2MenuItems property.

Instead of having

public ObservableCollection<EMSMenuItem> Level2MenuItems { get; set; }

you need

private ObservableCollection<EMSMenuItem> _level2MenuItems;
public ObservableCollection<EMSMenuItem> Level2MenuItems
{
    get { return _level2MenuItems; }
    set 
     {
        _level2MenuItems = value; 
        RaisePropertyChanged(nameof(Level2MenuItems));
     }
 }

The reason the former works in the constructor is that the Binding has not taken place yet. However since you are changing the reference via a command execute which happens after the binding you need to tell view that it changed

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