(() => {
    let category = workspace.getToolbox().getToolboxItemById('category_sensors');
    category.updateFlyoutContents(flyout_contents.concat([{
        "kind": "label",
        "text": "　",
        "web-line": "4.0",
        "web-line-width": "200"
    }]));
    flyout_contents = [];
})();