[Vala] How to force window destroy?

[Tomasz Jankowski <tomcioj gmail com>]

Hello!

I have a window with button inside it and I want to destroy window. Then in
button's click event handler i want to destroy window. The problem I that I
cannot find wrapper for gtk_widget_destroy() and I have no idea ho to do
this. Maybe it's because memory model based on reference counting, I'm not
sure, so I'm asking for explanation.