In another post chain there's a conversation about binding. The main bit about binding is the ability to bind to any property of a xaml element and have the ViewModel/code behind provide the notification when the underlying property/variable changes..

private bool _isVisible;
public bool IsVisible
{
    get { return _isVisible; }
    set
    {
        if (_isVisible != value)
        {
            _isVisible = value;
            Noesis.Reflection.PropertyChanged("IsVisible");
        }
    }
}

2 questions about unity too
1) I see the unity option only includes forum support, any chance you could sell an upgrade to email support too? (maybe a monthly fee for that support?)
2) Will you sell it on the asset store? pretty pretty please with sugar on top? Even if it means you're selling both in & out of the asset store and the asset store version is more expensive? this makes it SO MUCH easier for me to manage licences and product as someone who owns 100s of assets on unity.