Adding custom widgets

I'm trying to add a custom widget for wxDirPickerCtrl.

AFAICS, I have created the necessary files:

~/.wxglade/widgets/widgets.txt

[Inputs]:I
dirpicker_ctrl

~/.wxglade/widgets/dirpicker_ctrl/

	codegen.py
	dirpicker_ctrl.py
	__init__.py
	lisp_codegen.py
	perl_codegen.py
	wconfig.py


When starting wxGlade, it reports:

INFO    : Loading widgets from ~/.wxglade/widgets/widgets.txt:

but despite no errors are reported, no widgets are loaded.

How can I find out what happens?

-- Johan