Get handles of all (figure) objects

Get a tree of object handles using the root as base

harr = CHILDINFO displays a tree of active handles in your command window. All found handles are returned in harr. Indices in harr are as displayed in the command window.
Output example:
>> harr = childinfo;
[00001] root
[00002] figure (Figure 1)
[00003] axes
[00004] line
[00005] axes
[00006] line
[00007] line
[00008] figure (Figure 2)
[00009] axes
[00010] rectangle
>> numel(harr)
ans =

10

>>