[Vala] How to setup vala with gtk

[Vernon <vmars316 live com >]

Hello,
Windows7:
I just downloaded "vala-0.12.0.exe vala 0.12.0  for Windows".
When i compile with "valac -o Gtk-01 Gtk-01.vala" 
vala can't find gtk.
error: namespace name "gtk" cannot be found.
How can i set up vala & gtk 
so that they work together?
I also, want a Gui Builder in the mix.
Is Glade a good choice? 
Thanks for your help...Vernon

Here is my source example code:
using Gtk;

int main (string[] args) {
    Gtk.init (ref args);

    var window = new Window ();
    window.title = "First GTK+ Program";
    window.border_width = 10;
    window.window_position = WindowPosition.CENTER;
    window.set_default_size (350, 70);
    window.destroy.connect (Gtk.main_quit);

    var button = new Button.with_label ("Click me!");
    button.clicked.connect (() => {
        button.label = "Thank you";
    });

    window.add (button);
    window.show_all ();

    Gtk.main ();
    return 0;
}