FileInputStream inputStream = new FileInputStream(file);
// load layout, but add the requested content before (via callback)!
toolWindowManager.getPersistenceDelegate().merge(
inputStream, MergePolicy.UNION,
new PersistenceDelegateCallback() {
// @Override
// public ToolWindow toolwindowNotFound(ToolWindowManager toolWindowManager, String toolWindowId, PersistenceNode node) {
// //logger.info("'toolwindow not found' Not supported yet.");
// return null;