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"Unrecognized method, property, or field 'Type' for class 'matlab.ui​.control.W​ebComponen​t'."

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In App Designer (MATLAB R2024a, Windows 10 Pro, 64-bit) I have a tab (app.tabFiles) that has a few ui components on it. When I query the Type property on all of them at once, I get the following error:
tf = strcmp({app.tabFiles.Children.Type}, 'uistatebutton') ; % This works fine with 7 other tabs, panels, etc
"Unrecognized method, property, or field 'Type' for class 'matlab.ui.control.WebComponent'."
However, if I query the Type of the components individually, each happily returns its Type. Huh?
I should mention, there are 13 components visible on the tab and 13 listed in the Component Browser. However, the tab has 14 Children - the extra child is the label (set to empty string) on a uieditfield component - but all respond as expected to the individual Type request.
Any idea what would cause that exception to be thrown? And how to avoid it?

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 14 Apr 2024
Edited: Fangjun Jiang on 14 Apr 2024
I think app.tabFiles.Children is an array of handles. Try tf = strcmp(get(app.tabFiles.Children,'Type'), 'uistatebutton')
Dave Watson
Dave Watson on 16 Apr 2024
Yes, thank you, that works. However, it should be equivalent to what I did and my approach works on other UI components with Children, with that one exception. Mysteries of MATLAB! Thanks, again.
Fangjun Jiang
Fangjun Jiang on 16 Apr 2024
close all;plot(1:3);
obj =
4x1 graphics array: Root Figure (1) Axes Line
ans = 'root'
ans = 4x1 cell array
{'root' } {'figure'} {'axes' } {'line' }
Unrecognized method, property, or field 'Type' for class ''.

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