How to get list of tags to all components of a GUI?

For an existing complex GUI, I would like to know the tag for every component that it contains. I have tried the following, but it skips some components such as pushbuttons in a uipanel, though it does list the tag name for the uipanel itself. I suspect the returned tags are only for the children of the GUI figure, but not for the children's children.

hFig = findall(groot, 'type', 'figure') % Get handle to GUI figure
tagList = sort(get(allchild(hFig), 'tag')) % Should return tag names for all GUI components but some are missing

[KAE]

I just found Yair Altman's uuinspect which looks useful for checking tags of all GUI components.