For instance, as soon as I delete the background/foreground/borderBrush value, the app crashes and debugging stops which I think due to the invalid value (empty string). Also with margin/padding set to 3 values only, e.g. padding="0 0 0" (VS doesn't even give me chance to complete what I'm typing!).
Is there anything I need to change or is this how XAML "live" editing supposed to work?