rangePadding and tickFrequency not working on SChartDateTimeAxis


I’m on a trial, and I am doing a proof of concept for a bubble series. My x axis will be a SChartDateTimeAxis, but I can’t get the rangePadding and tickFrequency to work. Neither seems to be applied to the chart when it is drawn. See code below and attached screenshot.

Screenshot: https://www.dropbox.com/s/ef8aey035f4prhi/iOS%20Simulator%20Screen%20shot%2019.%20mai%202014%2015.17.00.png

SChartDateTimeAxis *xAxis = [[SChartDateTimeAxis alloc] init];
    xAxis.title = @"Hour";
    xAxis.majorTickFrequency = [SChartDateFrequency dateFrequencyWithHour:1];
    xAxis.minorTickFrequency = [SChartDateFrequency dateFrequencyWithHour:1];
    xAxis.rangePaddingLow = [SChartDateFrequency dateFrequencyWithHour:1];
    xAxis.rangePaddingHigh = [SChartDateFrequency dateFrequencyWithHour:1];