Is it possible to add tabs in widgets?
function getCMSFields()
{
$fields = parent::getCMSFields();
$fields->addFieldToTab('Root.Test', new TextField('BannerTitel', 'BannerTitel'));
return $fields;
}
Gives the error: FATAL ERROR: FieldSet::addFieldToTab() Tried to add a tab to a FieldSet object - 'Root' didn't exist.