Error with JAVAFX 1.3. and Neatbeas

Hi guys, i istalled Netbeans 6.9.1 and javaFx 1.3.1 but when i write a sample hello word example
package Helloword;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.scene.text.Font;

Stage {
title: "Hello JavaFX"
width: 250
height: 80
scene: Scene {
content: Text {
font : Font {
size : 16
}
x: 10, y: 30
content: "Hello World from JavaFX"
}
}
}
when i build project i have this error:
no main classes found
can you help me?
best regads
Antonio