code: @Override
  	public void start(BundleContext context) throws Exception {
  		super.start(context);
  		ResourcesPlugin.getWorkspace().addResourceChangeListener(ResourceManager.getInstance());
  		plugin = this;
  	}
docs: /*
  (non-Javadoc)
  @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)