[Vala] calling the parent constructor.

[Rodrigo Herefeld <rodrigo herefeld gmail com>]

Hi all!
i wrote a class extending a Gtk.Dialog, on my constructor i use
"this.vbox"  to put the widgets, until this comom,
but when i compile i've got a warning "assignment from incompatible pointer
type", i wonder this is because the
Dialog is no initialized at this point, even the program working i's like
to go away with the message, in python i
must call the parent init before can go on like this:

Dialog.__init__(self)

how do i make this in vala?

-- 
Rodrigo Cesar Herefeld