HeatMapLayer: Options: drawOrder property?

[MichaelBakkerDP]

The documentation for the HeatMapLayer Options object defines a 'drawOrder' property, with which a z-index like value can be set to control layering. See documentation. However the typescript definition (loaded through: https://www.bing.com/api/maps/mapcontrol?callback=initBingMap&key=${ key } ) does not expose this field. This may be the case, but what is the alternative for this field? I.e. how can i control the order or depth in which this layer is drawn?