[amibroker] Space at top of chart

[Julian]

How can I add space only at the top of the chart? I want to add space up here 
to draw various info.

GraphXSpace adds it to the top and bottom. Is there a variable just for the top?

I've also tried setChartOptions using (Status("axismaxy")+20) and 
(HighestVisibleValue(High)+20) for the ymax parameter but with no success.

I want the exact same behaviour as GraphXSpace, but only at the top of the 
chart.

Cheers,
Julian.