Perl data structure browser

 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.