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i have a custom DateTimeAxisViewModel and want to set major and minor ticks by user input. If the user sets valid values i use following code:

AutoTicks = false;
MajorDelta = TimeSpan.FromSeconds(USERINPUT);
MinorDelta = TimeSpan.FromSeconds(USERINPUT);

Everything works fine. If the user sets an invalid input i want to automatically calculate major and/or minor ticks. My idea was to use the DateTimeTickProvider and call GetMajorTicks()/GetMinorTicks() and then use the result to set the delta like in the code example above.
However GetMajorTicks()/GetMinorTicks() need IAxisParams as input. I couldn’t find IAxisParams as a member of my DateTimeAxisViewModel so i tried this:

public class CustomAxisParams : IAxisParams
    public IRange GetMaximumRange()
        throw new NotImplementedException();

    public IRange VisibleRange { get; set; }
    public IRange<double> GrowBy { get; set; }
    public IComparable MinorDelta { get; set; }
    public IComparable MajorDelta { get; set; }

    public AxisParams(IRange visibleRange, IRange<double> growBy, IComparable minorDelta, IComparable majorDelta)
        VisibleRange = visibleRange;
        GrowBy = growBy;
        MinorDelta = minorDelta;
        MajorDelta = majorDelta;

public class CustomDateTimeAxisViewModel : DateTimeAxisViewModel
    private TimeSpan GetAutoMajorDelta()
        var dateTimeTickProvider = new DateTimeTickProvider();
        var axisParams = new AxisParams(VisibleRange, GrowBy, MinorDelta, MajorDelta);
        var majorTicks = dateTimeTickProvider.GetMajorTicks(axisParams);

        if (majorTicks.Count < 2)
            return TimeSpan.Zero;

        // return diff between majorTicks[0] and majorTicks[1]

This does not work because GetMajorTicks() returns always an empty list. How can i achieve the desired behaviour?

Thanks for your help.

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