I think you have to set a property on the Entry widget to hide the text - similiar to -show => '*' for Perl/Tk (Entry widget). This code might make it so that the characters being typed are not visible.

$entry->set_visibility ($visibility);
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Where $visibility is a boolean value.

Here's some info from http://www.gnome.org/~james/pygtk-docs/class-gtkentry.html - a page on gtk.

gtk.Entry.set_invisible_char

instance.set_invisible_char(ch);

ch
a Unicode character

     Sets the character to use in place of the actual text when gtk.En
+try.set_visibility() has been called to set text visibility to FALSE.
+ i.e. this is the character used in "password mode" to show the user 
+how many characters have been typed. The default invisible char is an
+ asterisk ('*'). If you set the invisible char to 0, then the user wi
+ll get no feedback at all; there will be no text on the screen as the
+y type.
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I didn't see any Perl/gtk calls to set_invisible_char, but it doesn't mean it doesn't exist.

That's it exactly! A million times I read it, and never seemed to see it. Funny how that happens....

Muchas gracias ^_^