datatip buttondownfcn callback not executing

2020 6 16
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更新时间：2021 2 7
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Hi,
In matlab 2020a, I'm trying to use the ButtonDownFcn with a datatip object. However, the callback never executes. I've tried playing with 'HitTest' and 'PickableParts' and still nothing happens.
When using 'ValueChangedFcn' the callback does execute.
What am I missing?
Code looks somewhat like this:
f = figure();
p = plot(x,y);
dt = datatip(p,1,1,'ButtonDownFunction',@myCallback);
set(dt,'PickableParts','visible');
set(dt,'HitTest','on');

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