#8 A/B/C buttons do not remain consistently depressed

[Gervase Lam]

(1) When I click on a delta in the output window, the A/B/C button(s) are depressed, depending on which delta I have chosen. I am able to modify the chosen delta(s) by clicking the A/B/C buttons. If a delta is chosen, then the relevant A/B/C button remains depressed.

(2) However, when I click on a delta in summary bar of the File A/B/C windows, the A/B/C buttons are not pressed. Nevertheless, I am still able to modify the chosen delta(s) by clicking the A/B/C buttons. The buttons still do not remain depressed if a delta is chosen.

Is the inconsistency between the above two situations intentional?