code: public void setButtons(java.util.Collection<Button> buttons) {
          if (buttons == null) {
              this.buttons = null;
              return;
          }
  
          this.buttons = new java.util.ArrayList<Button>(buttons);
      }
docs: <p>
  The list of options to show to the user.
  </p>
  
  @param buttons
  The list of options to show to the user.