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    <p>Here you go. This example will use CSS to turn the button shape into a square, and install a validation listener to track layout changes to the buttons and update the widths accordingly.</p> <pre><code>public class SquareButtons extends Application { @Override public void start(final Stage stage) throws Exception { /* Assume these are your toolbar elements */ final Button[] buttons = new Button[]{ new Button("Short"), new Button("Slightly longer"), new Button("Very very very long button") }; /* This would, of course, belong in a style sheet - it turns the buttons square */ for (Button b : buttons) b.setStyle("-fx-background-radius: 0"); /* This will set the pref width/height of all your buttons to the maximum of the pref width/height of the larget one */ final InvalidationListener listener = new InvalidationListener() { public void invalidated(final Observable observable) { double size = 0; for (Button b : buttons) { size = Math.max(size, b.prefWidth(Integer.MAX_VALUE)); size = Math.max(size, b.prefHeight(Integer.MAX_VALUE)); } for (Button b : buttons) { b.setPrefWidth(size); b.setPrefHeight(size); } } }; for (Button b : buttons) b.widthProperty().addListener(listener); final ToolBar toolbar = new ToolBar(); toolbar.getItems().addAll(buttons); final Scene scene = new Scene(toolbar); stage.setScene(scene); stage.setWidth(800); stage.setHeight(200); stage.show(); } public static void main(String[] args) { Application.launch(args); } } </code></pre> <p>Update: Didn't read question thoroughly enough, see comment.</p>
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    1. POSet ToolBar Buttons square and all the same size in JavaFX 2
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    1. COI think the OP meant "square" in the sense that the button heights and widths are all the same. Your example would be closer to the intent if you added "b.setPrefHeight(width)" in the same place you set the width in the InvalidationListener. I don't think he meant to make the button corners square.
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    2. COYou are, of course, right - my bad. I've updated the answer accordingly, although square text buttons are just ugly imho.
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    3. COI did mean square as in the width and height are the same size. I was hoping this could be achieved with the binding api however this works perfectly so thanks very much for the answer.
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