'Wx::Perl::DataWalker' implements a 'Wx::Frame' subclass that shows a
relatively simple Perl data structure browser. After opening such a frame
and supplying it with a reference to an essentially arbitrary data
structure, you can visually browse it by double-clicking references.

So far, there is no tree view but only a display of the current level of
the data structure. You can traverse back up the structure with a _back_
button.

Optionally, 'Wx::Perl::DataWalker' displays the (approximate!) size of the
data structure using 'Devel::Size'.