Core-Plot: CPPlotSpaceDelegate methods not getting called in iPhone SDK

CPPlotSpaceDelegate methods not getting called in my app.

I have tried putting delegate开发者_开发技巧 implementation tag in header like

<CPPlotSpaceDelegate,CPPlotDataSource>

EDIT:

I have even tried

plotSpace.delegate=self;

but does not seem to work

What could be wrong?

change it to

graph.defaultPlotSpace.delegate = self;

Thanks

Pratik Goswami