[Flutter] Flutter how change dynamic the lable of textfield

I'm trying to change the lable of a textfield after klick on a radio button.

Here my example:





If im klick on radio button private the textfield lable should change. I try to change a variable if im click on radio button. The value of variable change but not update the lable.

Here my textfield:

//name
class BuildAppFieldName extends StatefulWidget {
@override
_BuildAppFieldName createState() => _BuildAppFieldName();
}

//name
class _BuildAppFieldName extends State<BuildAppFieldName> {
@override
Widget build(BuildContext context) {
return Container(
width: MediaQuery.of(context).size.width * 0.8,
height: MediaQuery.of(context).size.height * 0.09,
child: TextFormField(
//controller: _controller_companyName,
style: TextStyle(
color: Colors.black,
),
decoration: InputDecoration(
labelText: 'Name*',
labelStyle: TextStyle(
color: Colors.black,
),
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.black,
),
),
),
onChanged: (value) {},
),
);
}
}



Here my radio button:

//radio button
class BuildAppRadioButton extends StatefulWidget {
@override
_BuildAppRadioButton createState() => _BuildAppRadioButton();
}

//radio button
class _BuildAppRadioButton extends State<BuildAppRadioButton> {
@override
Widget build(BuildContext context) {
return Row(
children: [
//spacer
Spacer(),

//radio button
Container(
width: MediaQuery.of(context).size.width * 0.37,
child: CustomRadioButtonRegister(
isPressed: btn_radio[0],
label: 'Private',
padding: const EdgeInsets.symmetric(horizontal: 5.0),
value: true,
groupValue: btn_radio[0],
onChanged: (bool newValue) {
setState(() {
btn_radio[0] = true;
btn_radio[1] = false;
});
},
),
),

//spacer
Spacer(),

//radion button
Container(
width: MediaQuery.of(context).size.width * 0.37,
child: CustomRadioButtonRegister(
isPressed: btn_radio[1],
label: "Company",
padding: const EdgeInsets.symmetric(horizontal: 5.0),
value: true,
groupValue: btn_radio[1],
onChanged: (bool newValue) {
setState(() {
btn_radio[1] = true;
btn_radio[0] = false;
});
},
),
),

//spacer
Spacer(),
],
);
}
}



Anyone have a idea how i can do this. Many thx

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