protected void InitialiseChildenCollection()
{
plotItems = new UniqueObservableCollection <Plot2DItem>();
plotItems.CollectionChanged += new NotifyCollectionChangedEventHandler(plotItems_CollectionChanged);
}
protected override void CreateLegends()
{
plotItems = new UniqueObservableCollection <Plot2DItem>();
plotItems.CollectionChanged += new NotifyCollectionChangedEventHandler(annotations_CollectionChanged);
base.CreateLegends();
}