"Activate" signal on GtkEditable

[WAN Hing Wah <50191914 ee cityu edu hk>]

>From my book, we can connect the "activate" signal to gtkentry,if user 
press enter key,the activate signal will be emitted,
but do the activate signal work for gtktext?
I try to connect activate signal with gtktext but seem they signal handler
seem havn't been called.
Although i can just connect it with key_pressed_event and process only 
when a enter key is received...but that's seem too troublesome...
So i wanna know if activate signal really work or other signal can use..