I've added a graph in my window, that in XAML is:

<WpfPlot  Grid.Row="1" Width="600" HorizontalAlignment="Left"  Name="GraphA" Grid.ColumnSpan="2" />

Then I add in my MainWindow() code:

double[] testGraph = new double[] { 100, 200, 300, 400 };
GraphA.Plot.AddSignal( testGraph );
GraphA.Plot.Render();

Though my window shows this:

I thought this was an easy enough start... what am I missing?