protected override void OnItemRemoving(ViewportRestriction item)
{
ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
if (attachable != null)
{
attachable.Detach(viewport);
}
item.Changed -= OnItemChanged;
}
protected override void OnItemAdded(ViewportRestriction item)
{
item.Changed += OnItemChanged;
ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
if (attachable != null)
{
attachable.Attach(viewport);
}
}
