fVariableBlock= new VariableBlock(listener, false);
fVariableBlock= new VariableBlock(listener, false, null);
	public ClasspathVariablesPreferencePage() {		setPreferenceStore(JavaPlugin.getDefault().getPreferenceStore());		IStatusChangeListener listener= new IStatusChangeListener() {			public void statusChanged(IStatus status) {				updateStatus(status);			}		};		fVariableBlock= new VariableBlock(listener, false);	}