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from The Object of My Callback by Dimitri Shvorob
(object references with Matlab timers)

CallbackDemo.m
%% Step through the script in cell mode

r = Widget.getInstance('red')     %#ok
%%
b = Widget.getInstance('blue')    %#ok
%%
b = Widget.getInstance('blue')    %#ok
%%
r.start
b.start
%%
pause(1)
%%
r.stop
b.stop
%%
clear r % has no effect, as demonstrated by:
r = Widget.getInstance('red')     %#ok

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