StimulusSection pair plots are not generated in AthenaDelayComp

[viktorpm]

Training works but stimulus pairs are not visible

[viktorpm]

GUI window size was modified to fit all fields.

Plots (axes) are created in StimulusSection case 'init' but new GUI elements (buttons and fields) remove them:

ToggleParam(obj, 'StimulusShow', 0, x, y, ...
            'OnString', 'Stimuli', 'OffString', 'Stimuli', ...
            'TooltipString', 'Show/Hide Stimulus panel');
        set_callback(StimulusShow, {mfilename, 'show_hide'}); %#ok<NODEF> (Defined just above)
        next_row(y);