This sample visualizes the crude oil production of the non-OPEC countries over the years. The data point values displayed are in million barrels per day units.
                        In this example, you can see how to customize the tooltip content in Heatmap. You can customize the tooltip content
                        by using the tooltipRender  event.
                    
Tooltip is enabled in this example, to see the tooltip in action, hover a point or tap on a point in touch enabled devices.
Injecting Module
                        Heatmap component features are segregated into individual feature-wise modules. To use a tooltip, inject the
                        Tooltip  module using the Heatmap.Inject(Tooltip)  method, and use a legend by injecting
                        the Legend  module using the Heatmap.Inject(Legend)  method.