The following code doesn't show the contents of the HBox (note that this is true even when you remove the setMaxHeight calls),

Button v = new Button("FOO");
v.setMaxHeight(Double.MAX_VALUE);

HBox infoLine = new HBox();
Label timeDisplay = new Label("AAA");
Label resultCount = new Label("BBB");
Label status = new Label("CCC");
infoLine.getChildren().addAll(timeDisplay, resultCount, status);
infoLine.setMaxHeight(Control.USE_PREF_SIZE);

GridPane view = new GridPane();
GridPane.setConstraints(v, 0, 0);
GridPane.setConstraints(infoLine, 0, 1);
GridPane.setVgrow(v, Priority.ALWAYS);
GridPane.setHgrow(v, Priority.ALWAYS);
GridPane.setVgrow(infoLine, Priority.NEVER);
GridPane.setHgrow(infoLine, Priority.NEVER);
view.getChildren().addAll(v, infoLine);

Scene sx = new Scene(view, 300, 500);
stage.setScene(sx);
stage.setVisible(true);