ColumnLabelStyle - Label at the base of the column instead of at the top of it

Hi, relentlessly I've searched the Internet for a way to display the labels of a column chart series at the base of the column instead of at the top of it.

What am I missing?

<Series ChartType="Column" IsValueShownAsLabel="True" Font="{0}, 9.5px" LabelForeColor="59, 59, 59" CustomProperties="PointWidth=0.75, MaxPixelPointWidth=40, LabelStyle=xxx">
</Series>

If you know the syntax for it, please let me know :)

Thanks