App Designer example not found

Hello,

I would like to view the code from App That Displays Data in a Hierarchy Using Tree.

When typing:

openExample('matlab/AppDesignerTreeExample')

the following error is displayed:

Error using findExample (line 35)

Example "AppDesignerTreeExample" not found in "C:\Program Files\MATLAB\R2018b\examples\matlab\examples.xml".

Error in openExample (line 24)

metadata = findExample(id);

Any suggestions? Are there any similar examples available?

[Robin]

I realized now that the following example show exactly what I'm looking for:

openExample('matlab/PopulateTreeNodesAppExample')