protected virtual void OnNewPropertyAdded(PropertyAddedEventArgs e)
{
var handler = NewPropertyAdded;
if (handler != null) handler(this, e);
}
private void PropertiesManagerOnNewPropertyAdded(object Sender, PropertyAddedEventArgs e)
{
if (e.Property.Placement != null)
Dispatcher.BeginInvoke((Action<PropertyViewModel>)Properties.Add, FabricateViewModel(e.Property));
}