* Investigate how to improve h2def.py or modify gdk.defs to define boxed type
  objects (GdkColormap, etc.)
* Figure out what's up with getting/setting gc background/foreground colors and
  how to get RGB values from pixels.
* Provide access to GTK version number.
* Fix $dialog->vbox->show() crash.
* See what other object definitions might have been missed by h2def.py.

In PHP
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* Modify var_dump() and print_r() to check get property handlers when
  dumping information.

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