opener.addTagHandler(taskDisplayHandler);
TaskDisplayColumnsTagHandler resourceViewHandler = new TaskDisplayColumnsTagHandler(
getUIFacade().getResourceTree().getVisibleFields(), "field", "id", "order", "width");
opener.addTagHandler(resourceViewHandler);
opener.addParsingListener(resourceViewHandler);
opener.addTagHandler(taskHandler);
opener.addParsingListener(taskPropHandler);
opener.addParsingListener(taskDisplayHandler);