The event facade fired with this event does not include the original pageX or pageY coordinates. I am not trying to do anything special, except position a tooltip in the document body rather than as
a child to the chart container. The main reason is that the chart container has it's overflow hidden, since it is in a scrollview. Also, it is very narrow, therefore the rendered tooltips are
obscured by the parent elements. I have setup my own planarEventHandler, appending the tooltip to the document body instead, but I cannot position it relative to the mouse cursor, since there is no
pageX or pageY parameter on the event facade.

I suppose this is a feature request, but it really does limit what you can do in the event handler.