Looking for complete Chart examples

[mrt181]

I have some problems with the showcase examples for charting.
I tried to copy the examples but they won't compile.

For example, the DynamicDataChart class has a method

public void onModuleLoad()

In the example this methods returns at three points but it's void???
My compiler tells me that "Void methods cannot return a value"

And how do I trigger the method onModuleLoad to show the generated Chart?

The showcase just shows me what I can do but not really how - like in a tutorial.