GroupIndex: Integer;
The GroupIndex property determines index of the group in which the ImageButton component is included.
The GroupIndex property is meant to divide buttons into different groups. Pressing the button that is included in the group, changes the state of all other buttons included in the same group.
By default the GroupIndex property is set to 0, and the button is not included in any group.
NOTE. The buttons united in the group should be placed within one parent component.
See also: