As mentioned in my previous article there is a third alternative for providing context help. This is also the most simple of all. On your wizard page class all you have to do is overriding the method performHelp:
public void performHelp(){
String contextHelpID = "ch.sahits.phpclassgenerator.filename";
getShell().setData(ECLIPSE_HELP,contextHelpID);
PlatformUI.getWorkbench().getHelpSystem().displayHelp(contextHelpID);
}
You will notice that this is the same code as in the widgetSelected method.