ScrollView and redraw...

I have been using OnEraseBkn() to draw my non-varying parts of my
application. But I want to be able to control certain parts in the
not to be redraw or persist while the user is scrolling. An example would
be, say you want to show a plot of something and you want the axis label
to always stay in view while the data points about being scrolled by. So
ultimately, you would the axis label to persist.
Does anyone have a suggestion or pieces of code that does such a thing?

Thanks,
nick