public List<TabConfig> getTabs() {
        if (tabs == null) {
            tabs = new ArrayList<>();
        }
        for (final TabConfig tabConfig : tabs) {
            tabConfig.setParent(this);
        }
        return tabs;
    }
The preferred size of this layout in width, height.
stroom-core-shared/src/main/java/stroom/dashboard/shared/TabLayoutConfig.java