title: JavaFX: Disable all Buttons from a ToggleGroup
body: <p>Like the title says, i want to disable all Buttons in a Togglegroup. I know it is possible to select the Buttons individually and <code>button.setDisable(true)</code>.</p>
  
  <p>But is there a possibillity like <code>group.setDisable(true)</code>?</p>
  
  <p>Thanks for any help or hints.</p>
  
  <p>Greetings</p>