How can I find instances of a given class that exist?

If I create a figure with several graphics objects,

h = figure;
axes(...);
axes(...);
axes(...);

I can find instances of specific graphics objects using the following command:

a = findobj(h,'Type','axes'); %this will return a 3x1 Axes object

What I would like to do is something similar but for objects of a given class. Suppose I have an app containing a toolpack.desktop.ToolGroup object, which itself contains multiple tabs (toolpack.desktop.ToolTab) and sections (toolpack.desktop.ToolSection). Is there are easy way to access these objects without storing them as properties of the app itself?

That is, I want to do something like:

tabs = findobj('Type','toolpack.desktop.ToolTab'); %to find all of the ToolTabs

(I'm not sure that findobj is the correct function here; I am just showing it for example). Can this be done?

[Jai Bhagat]

any solution found?

[Hyeokjin Jho]

any solution found?