we tried your example in http://www.aspose.com/wiki/default.aspx/Aspose.Cells/CustomChart.html, and we copied the demo code in VS 2005, after executing, it returned a result in attachment :
like this with two axes :
http://www.aspose.com/Products/Aspose.Chart/Demos/CodeChart.aspx?GalleryItemId=12
thank you !
Please set chart.SecondValueAxis.IsVisible to true and specify which data series will draw on the second axis.
thx a lot