Contains all the graph nodes in the graph chart. Each node ( RSGraphCharts.TRSGraphChartValue ) defines its Level and outward Links, as well as its own shape (Style), size (Width and Height), Color, Caption, etc. When a graph chart value is added to the collection, it is initialized to the DefaultShape. Use the Values collection to add, delete, and modify graph chart values, or nodes, in the chart.
Note that graph nodes are drawn from first to last through the collection, so later nodes are "on top" of earlier nodes.