internal void OnLayoutElementRemoved(LayoutElement element)
{
if (element.Descendents().OfType<LayoutContent>().Any(c => c == LastFocusedDocument))
LastFocusedDocument = null;
if (element.Descendents().OfType<LayoutContent>().Any(c => c == ActiveContent))
ActiveContent = null;
if (ElementRemoved != null)
ElementRemoved(this, new LayoutElementEventArgs(element));
}
internal void OnLayoutElementAdded(LayoutElement element)
{
if (ElementAdded != null)
ElementAdded(this, new LayoutElementEventArgs(element));
}