Django Model Field as Button Group

Question

How can i create a button group using Django model fields and widgets?

#models.py

GENDER_CHOICES = (
   ('M', 'Male'),
   ('F', 'Female'),
   ('-', 'Other')
)

class Profile(models.Model):
     gender = models.CharField(choices=GENDER_CHOICES, max_length=128)

This field is rendering as a Select field, a dropdown, but i need a button group, just like this.