Editing the attached FXML-file, which contain a single GridPane without row/col-constrains, causes diffenert Bugs:

1. In the Titlepane "Hierarchy" the Gridpane is not selectable.
   After hide/show the Titlepane "Hierarchy" a selection is possible.

2. open file -> try to select the Gridpane per click ->
   drag & drop a node over the Gridpane in the Hierarchy Panel-> SceneBuilder crashes or freezes for a while

3. open file -> DONT try to select the Gridpane ->
   drag & drop a node directly over the Gridpane Hierarchy Panel-> node added, but render at the wrong position

<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<GridPane xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8">
</GridPane>