JavaPlugin.getDefault().getPreferenceStore().removePropertyChangeListener(fPropertyChangeListener);
JavaPlugin.getDefault().getCombinedPreferenceStore().removePropertyChangeListener(fPropertyChangeListener);
	protected void internalDispose() {		fViewer= null;		JFaceResources.getFontRegistry().removeListener(fFontPropertyChangeListener);		JavaPlugin.getDefault().getPreferenceStore().removePropertyChangeListener(fPropertyChangeListener);	}