A group of BaseButton-derived buttons. The buttons in a ButtonGroup are treated like radio buttons: No more than one button can be pressed at a time. Some types of buttons (such as CheckBox) may have a special appearance in this state.
Every member of a ButtonGroup should have BaseButton.toggle_mode set to true.
Emitted when one of the buttons of the group is pressed.
If true, it is possible to unpress all buttons in this ButtonGroup.
Returns an Array of Buttons who have this as their ButtonGroup (see BaseButton.button_group).
Returns the current pressed button.







