private void ExecuteDrawableViewbox(XmlElement element, Collection<IDrawable> drawables)
{
double upperLeftX_ = Variables.GetValue<double>(element, "upperLeftX");
double upperLeftY_ = Variables.GetValue<double>(element, "upperLeftY");
double lowerRightX_ = Variables.GetValue<double>(element, "lowerRightX");
double lowerRightY_ = Variables.GetValue<double>(element, "lowerRightY");
drawables.Add(new DrawableViewbox(upperLeftX_, upperLeftY_, lowerRightX_, lowerRightY_));
}
}