Question: filling area under curve from odeplot

I am plotting a curve generated from odeplot and I would like to fill the area under this curve.  I have tried filled=true and filled=[color="Blue",transparency=0.5] in the call to odeplot but it only plots the curve with no underfill.  Please advise on how to shade the area under a curve generated from odeplot.  Thanks very much.

Please Wait...