How to do aligned scrolling through two chart area

问题:

I have two ChartArea objects in a Chart (System.Windows.Forms.DataVisualization.Charting is what I'm using).

One is a Point graph, and the other is a RangeBar graph. The horizontal axis on the RangeBar graph is actually the Y axis, so I cannot just use something like this:

Chart1.ChartAreas["Chart Area 2"].AlignWithChartArea = "Default";

I've figured out how to zoom both charts and keep them aligned, but when I try to scroll both charts by clicking on the scrollbar on one of the horizontal axes, I can't quite get it to line up. They almost line up, but they're off by maybe a second or so (the horizontal axis in both graphs is time).

Here's what I have:

private void theChart_AxisViewChanged(object sender, ViewEventArgs e)
{
    if (e.ChartArea == theChart.ChartAreas["MyPointChartArea"])
    {
        theChart.ChartAreas["MyRangeBarChartArea"].AxisY.ScaleView.Position = e.NewPosition;
        theChart.ChartAreas["MyRangeBarChartArea"].AxisY.ScaleView.Size = e.NewSize;
        theChart.ChartAreas["MyRangeBarChartArea"].AxisY.ScaleView.SizeType = e.NewSizeType;
    }
    if (e.ChartArea == theChart.ChartAreas["MyRangeBarChartArea"])
    {
        theChart.ChartAreas["MyPointChartArea"].AxisX.ScaleView.Position = e.NewPosition;
        theChart.ChartAreas["MyPointChartArea"].AxisX.ScaleView.Size = e.NewSize;
        theChart.ChartAreas["MyPointChartArea"].AxisX.ScaleView.SizeType = e.NewSizeType;
    }
}

What else do I need to do to get the charts to line up? The physical extent of the charts is the same. It's just the data that are slightly misaligned.

Thanks for any help.