protected ConnectorViewModel(ElementViewModel element, string name, Color color)
{
_element = element;
_name = name;
_color = color;
}
public OutputConnectorViewModel(ElementViewModel element, string name, Color color, Func<BitmapSource> valueCallback)
: base(element, name, color)
{
_connections = new BindableCollection<ConnectionViewModel>();
_valueCallback = valueCallback;
}