Creates a new #GtkRadioButton containing a label. The label will be created using gtk.label.Label.newWithMnemonic, so underscores in label indicate the mnemonic for the button.
widget to get radio group from or null
the text of the button, with an underscore in front of the mnemonic character
a new #GtkRadioButton
Creates a new #GtkRadioButton containing a label. The label will be created using gtk.label.Label.newWithMnemonic, so underscores in label indicate the mnemonic for the button.