Hi jharwood,
You need to create a separate ScatterPlot for each plot, associate it with unique axes, associate the graph with these axes, and then add the plots to the graph. Here is the code in C#, the ideas should be similar VB:
XAxis xAxis1 = new XAxis();
xAxis1.Range = new Range(0, 10);
YAxis yAxis1 = new YAxis();
yAxis1.Range = new Range(0, 10);
ScatterPlot plot1 = new ScatterPlot(xAxis1, yAxis1);
plot1.PlotXY(new double[] { 0, 1, 2 }, new double[] { 0, 1, 2 });
XAxis xAxis2 = new XAxis();
xAxis2.Range = new Range(0, 20);
YAxis yAxis2 = new YAxis();
yAxis2.Range = new Range(0, 20);
ScatterPlot plot2 = new ScatterPlot(xAxis2, yAxis2);
plot2.PlotXY(new double[] { 0, 10, 20 }, new double[] { 20, 10, 0 });
scatterGraph1.XAxes.Add(xAxis1);
scatterGraph1.YAxes.Add(yAxis1);
scatterGraph1.XAxes.Add(xAxis2);
scatterGraph1.YAxes.Add(yAxis2);
scatterGraph1.Plots.Add(plot1);
scatterGraph1.Plots.Add(plot2);Regards,