public static void ExecuteOnUnload(FrameworkElement element, RoutedEventHandler handler)
{
#endif
#if !XFORMS
FrameworkElement.UnloadedHandler unloaded = null;
unloaded = (s, e) => {
element.Unloaded -= unloaded;
handler(s, e);
};
element.Unloaded += unloaded;
#endif
}
/// <summary>
/// Executes the handler when the element is unloaded.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="handler">The handler.</param>
#if NOESIS
public static void ExecuteOnUnload(FrameworkElement element, FrameworkElement.UnloadedHandler handler)
{