Create AxisDateTime at runtime

I am trying to create following code at runtime after i deleted the old axis.

Snippet

<ni:AxisDateTime x:Name="xAxis" Orientation="Horizontal" Adjuster="ContinuousChart" Range="00:00:00, 00:00:20"><ni:AxisDateTime.MajorDivisions>        <ni:RangeLabeledDivisions LabelPresenter="mm:ss" /></ni:AxisDateTime.MajorDivisions></ni:AxisDateTime>

 So far i tried like this

Snippet

AxisDateTime newAxis = new AxisDateTime();
newAxis.Orientation = Orientation.Horizontal;
newAxis.Adjuster = RangeAdjuster.ContinuousChart;
newAxis.MajorDivisions.LabelPresenter = "mm:ss";

 The problem lies with setting the LabelPresenter. I got no clue how to set it.

Greetings

rizardus