Integer value that this radio button represents.
Each radio button in a group must have a unique value. The selected button in a group can then be set or retrieved through the Efl.Ui.Radio_Group.selected_value property. This value is also informed through the Efl.Ui.Radio_Group.value,changed event.
All non-negative values are legal but keep in mind that 0 is the starting value for all new groups: If no button in the group has this value, then no button in the group is initially selected. -1 is the value that Efl.Ui.Radio_Group.selected_value returns when no button is selected and therefore cannot be used.
Since 1.23
@property state_value { get {} set {} values { value: int; } }
int efl_ui_radio_state_value_get(const Eo *obj); void efl_ui_radio_state_value_set(Eo *obj, int value);