plot range in Object Graphics

[Brad Gom <b_gom(at)hotmail.com>]

If I have a simple x-y plot in object-graphics, how to I make the plot
lines extend all the way to the axis borders like they do in direct
graphics?   For example, the following code produces a line plot that
extends flush to the right axis:

x=findgen(10)
plot, x, sin(x), xrange=[0,8.5], /xstyle

If I make an IDLgrPlot object with the same data and xrange, and some
IDLgrAxis objects with the proper xrange and yrange, then the plot stops
at the last datapoint- namely x=8.

Is there an obvious way to fix this that I'm missing?


Thanks

Brad