AllowAllUp: Button;
The AllowAllUp property determines whether all buttons included into the group can be unpressed at the same time.
By default the AllowAllUp property is set to False, one button in the group must be always unpressed.
If the property is set to True, it is possible to release all the buttons. Pressing or releasing of buttons is made on the mouse click or by pressing the space key when the button gets focused. Status of the buttons can also be controlled by changing value of the IPPSwitchButton.Down property.
See also: