Not sure if you still need this but I used this from another post
widget.on('render',function(w, e){e.prefixText = '';
e.suffixText = '';
e.selectedColor = '#014E66'; /*The color of the chosen title*/
e.fontColor = '#cccccc'; /*The color of the unchosen titles*/
e.elementWidth = '103%';
e.descColor = '#a5a5a5';
e.parentMarginLeft = '-15px';
e.height = 32; /* affects the tabber widget default high*/
});
widget.tabs = [{title: "Orgs, Modules, Departments", displayWidgetIds :
//widget group on tab 1
["66047fbdaf582e003f18d125","65fc49001d67960040327743","660481b6af582e003f18d141"],
//widget group on tab 2
hideWidgetIds : ["65fc48c91d6796004032773e","660480c1af582e003f18d135"]},
{title: "Assignments and Viewers", displayWidgetIds : ["65fc48c91d6796004032773e","660480c1af582e003f18d135"],
hideWidgetIds : ["65fc49001d67960040327743","66047fbdaf582e003f18d125","660481b6af582e003f18d141"]}
]