[news.eclipse.platform.pde] Launching an application from 'run' method?

["klm" <ddd@xxxxxxx>]

I have created the HelloWorld example project in the PDE
perspective.  Now in the class SampleHandler there is the function 'run':


/**
 * The action has been activated. The argument of the
 * method represents the 'real' action sitting
 * in the workbench UI.
 * @see IWorkbenchWindowActionDelegate#run
 */
public void run(IAction action) {

 MessageDialog.openInformation(window.getShell(),"MyPlugin", "Hello, 
Eclipse world");
 MyApp myApp = new MyApp();
 myApp.launch();

}



I would like to run the application MyApp when the button is pressed in the 
workbench but I just get a box saying:

"The chosen operation is not currently available"


It should be mentioned that the MyApp is an application from an external jar 
that I have added to the build path.

How do I launch my own application when I press the generated button in the 
workbench?