Silverstripe 3 / Tabset / Special Chars / Issue - tabs

Question

I'm extending SiteConfig and create a new Tabset. I can't get it to work properly ; when using special chars in tabnames, the layout is mixed up.
I also tried it with _t('MyClass.MyMainTab','Public') and a german language-yml without success. (also no success with & Ouml ;)
How can i use SpecialChars in tab names (Tabset - names)?
yml:
SiteConfig:
extensions:
- MyClass
MyClass:
class MyClass extends DataExtension{
public function updateCMSFields(FieldList $fields){
$set = new TabSet(
'ÖffentlicherBereich', // PROBLEM !!!!!
new Tab(
'Einstellungen',
new LiteralField('Bla', 'Blabla')
),
new Tab(
'OtherTab',
new LiteralField('Blabla', 'Bla')
),
new Tab(
'AnotherTab',
new LiteralField('Blabla', 'Bla')
)
);
$fields->addFieldToTab('Root.Main.Main', $set);
}
}

Answer 1

I'd try to use ->setTitle() to add the title containing Umlauts if
the formfield ID has problems with umlauts.
add the tabset to the Root tab directly, as it should be on the same level as Root.Main
Use Tabset::create() instead instead of new Tabset() for daisy chaining (and possible use of Injector)
Modified, untested code:
$set = TabSet::create(
'OpeningTimes', // PROBLEM !!!!!
Tab::create(
'Einstellungen',
new LiteralField('Bla', 'Blabla')
),
Tab::create(
'OtherTab',
new LiteralField('Blabla', 'Bla')
),
Tab::create(
'AnotherTab',
new LiteralField('Blabla', 'Bla')
)
)->setTitle('Öffnungszeiten');
$fields->addFieldToTab('Root', $set);