You can do this using the Buttons, OldValue, and NewValue properties described here. If you have a button group where the last button is named "next", the following callback will allow you to cyclically toggle the other buttons.
This code checks whether the "next" button has been selected. If so, It finds the index of the previously selected button, identifies the next button down, and sets its value to true.
function ButtonGroupSelectionChanged(app, event)
if strcmp(event.NewValue.Text, 'next')
buttonNameCell = {app.ButtonGroup.Buttons(1:end-1).Text};
lastSelectionIx = find(strcmp(buttonNameCell, event.OldValue.Text));
numButtons = numel(app.ButtonGroup.Buttons);
nextButtonIx = mod(lastSelectionIx, numButtons-1) + 1;
isButtonPressedArray = false(1:numButtons);
isButtonPressedArray(nextButtonIx) = true;
for k = 1:numButtons
app.ButtonGroup.Buttons(k).Value = isButtonPressedArray(k);
end
end
end
