gtk+ about dialog doesn't close

["John Zoidberg" <zohn joidberg gmail com>]

Hi,

I have a problem with the gtk about dialog: When I click on the Close button
it doesn't close.
There seems to be no event connected to the close button clicked signal.
And I can't add one either in Glade (v2 as well as v3).

What am I supposed to add to the code so that it works?