How to detect whether a figure is created by uifigure()

I have the following in my startup.m file,

   set(groot,'defaultFigureCreateFcn',@(fig, ~)addToolbarExplorationButtons(fig));

which throws an error when a uifigure is created,

   fig = uifigure;

Error using matlab.ui.Figure/set

Functionality not supported with figures created with

the uifigure function.

So, the question becomes, how can I pre-detect whether fig has been created by uifigure() as opposed to figure()? There don't appear to be separate classes reserved for the two,

>> class(figure)

ans =

'matlab.ui.Figure'

>> class(uifigure)

ans =

'matlab.ui.Figure'

Answer 1

[Bruno Luong]

This command sreturns true for uifigure handle fig

matlab.ui.internal.isUIFigure(fig)

[Matt J]

It works, which helps a lot. Although, it is peculiar and disquieting that it requires undocumented Matlab.

[Walter Roberson]

See also https://www.mathworks.com/matlabcentral/answers/348387-distinguish-uifigure-from-figure-programmatically#comment_1474400