private void View_MultiDrawingItemDeleting(object sender, MultiDrawingItemEventArgs e)
{
HistoryMemento memento = new HistoryMementoDeleteMultiDrawingItem(frameServer.Metadata, e.Manager, e.Item.Id, SerializationFilter.All);
frameServer.Metadata.DeleteMultiDrawingItem(e.Manager, e.Item.Id);
historyStack.PushNewCommand(memento);
}
private void View_MultiDrawingItemAdding(object sender, MultiDrawingItemEventArgs e)
{
HistoryMemento memento = new HistoryMementoAddMultiDrawingItem(frameServer.Metadata, e.Manager, e.Item.Id);
frameServer.Metadata.AddMultidrawingItem(e.Manager, e.Item);
historyStack.PushNewCommand(memento);
}