Abri e fechar Stage

Button {
                            text: "Abrir Stage"
                            layoutX:180
                            layoutY:50
                            action: function() {


                                javafxapplication1.tela2.t2;


                            }
                    }
                    }

package javafxapplication1;
import javafx.scene.*;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.scene.text.*;
import javafx.stage.*;
import javafx.scene.control.Button;



public def t2: Stage = Stage {
    title: "Fechar"
    width : 300 height : 200
    //style: StageStyle.TRANSPARENT
    //opacity: 0.5
    scene : Scene {
            content: [
                            Button {
                            layoutX:50
                            layoutY:50

                            text: "Button"
                            action: function() {
                               t2.close();
                            }
                    }

                
            ]
    }
   
}