Source:
en.wikipedia.org
This sample depicts the number of international airports available in various countries in South America. On hover, the items details will be displayed in tooltip.
In this example, you can see how to apply equal color mapping and apply colors to TreeMap items based on certain value. Tooltip template is enabled in this example. To see the tooltip in action, hover the mouse over an item or tap an item in touch enabled devices. More information on tooltip can be found in this documentation section.