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Using builder with TrackballBehavior has unexpected behavior

I'm trying to create a custom component for my trackball tooltip so I'm using the builder parameter, but I also want to disable the trackball line and display the tooltip in a fixed position (top left corner of the chart), in total I'm setting 

- trackBallBehavior.lineType = none

- tooltipDisplayMode: TrackballDisplayMode.groupAllPoints,

- tooltipAlignment: ChartAlignment.near,

- trackballArgs.chartPointInfo.xPosition = 0 (in onTrackballPositionChanging).

If I don't set a custom builder I get something close to what I want, the tooltip is fixed in the top left corner of the chart and the trackball line is hidden, but if I implement the builder then the line comes back and the x position goes back to normal, so my custom component appears next to the line.