The Trade Markers demo uses the Annotations API to place CustomAnnotations rendering buy and sell or news bullet markers over a simulated price chart.
The CustomAnnotations are created and added using SVG to the sciChartSurface.annotations collection. They may be placed above or below candles with our helpful API.
News/Event bullet annotations use AnnotationBase. yCoordinateMode = ECoordinateMode. RelativeY to always place the event bullet at the bottom of the chart.