Need help on generating GD graph with two-axes

[linda]

I can use GD::Graph to generate a graph with two-axes by using two
datasets and generate a stacked bar chart by using multiple datasets
now.
However, I want to generate a mixed-type graph which contains a
stacked bar chart and a linespoints chart. Is this possible for me to
generate the stacked bar chart by setting 'cumulate' option against
the left axis and to generate the linespoints charts against the right
axis simultaneously?

Thanks very much in advance for your prompt reply!