Python-libnotify showing weird behaviour with xfce4-notifyd and notify-osd

I am trying to play with libnotify's python bindings. I got this code from /usr/share/doc/python-notify/examples and it is showing different behaviour with xfce4-notifyd and notify-osd.

Case-1 with xfce4-notifyd

http://i.stack.imgur.com/jqfgG.png


Case-2 with notify-osd

http://i.stack.imgur.com/FQjdC.png

You can see the difference in both the cases. In 1st case the action is integrated in the form of button in xfce4-notifyd whereas in 2nd case this is not happening. In 2nd case it just shows up as a new window.

So, can anyone tell me why I am observing this weird behaviour and how do I add action buttons to notify-osd notifications.

PS: I am using the patched version of notify-osd. My notification with notify-osd looks like

http://i.stack.imgur.com/C5ADX.png