Show chart with SurfaceChart and XYZLineChart combined

[ThomasDaheim]

Hi,

and here is another thing I wasn't able to achieve so far: Combine a SurfaceChart with a XYZLineChart in one chart.

Usage: My GPXEditor should show a gpx track (XYZLineChart) on top of the SRTM height data (SurfaceChart).

Again I'm failing to add a screenshot of how things should look like here :-( But hopefully, the idea is clear.

Any hints are appreciated! Thomas