internal static void SetUwpControlValue(this WindowsXamlHostBase wrapper, object value, [CallerMemberName] string propName = null)
 {
     Windows.UI.Xaml.UIElement control = wrapper.GetUwpInternalObject() as Windows.UI.Xaml.UIElement;
     if (control != null)
     {
         control.GetType().GetRuntimeProperty(propName).SetValue(control, value);
     }
     else
     {
         Dictionary <string, object> properties = GetDesignerProperties(wrapper);
         properties[propName] = value;
     }
 }
        internal static object GetUwpControlValue(this WindowsXamlHostBase wrapper, object defaultValue = null, [CallerMemberName] string propName = null)
        {
            Windows.UI.Xaml.UIElement control = wrapper.GetUwpInternalObject() as Windows.UI.Xaml.UIElement;
            if (control != null)
            {
                return(control.GetType().GetRuntimeProperty(propName).GetValue(control));
            }
            else
            {
                Dictionary <string, object> properties = GetDesignerProperties(wrapper);
                if (properties.ContainsKey(propName))
                {
                    return(properties[propName]);
                }

                return(defaultValue != null ? defaultValue : GetDefaultValueForProperty(wrapper, propName));
            }
        }