Close a stage using the netbeans javaFX-composer

Hi, can anybody tell me how to close and open a new stage by a "if query"? (sorry for my english)
something like this:
if (a==b) {
close the current stage
and open this
var d = NextStage{};
javafx.stage.Stage {
title: "My new Stage"
scene: d.getDesignScene();
there must be a easy way to do it?! Thanks for your help

h3. *{color:#ff0000}Oracle Forums - Starting Sept 24th, 2010, these forums will be read-only. At that time, there will be new forums created at [http://forums.oracle.com] to accommodate most of the discussion topics here.{color}*
db

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Close a stage using the netbeans javaFX-composer

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