code: public AbstractButton configure(AbstractButton button) {
          Assert.notNull(button);
          button.setText(this.labelInfo.getText());
          button.setMnemonic(this.labelInfo.getMnemonic());
          button.setDisplayedMnemonicIndex(this.labelInfo.getMnemonicIndex());
          configureAccelerator(button, getAccelerator());
          return button;
      }
docs: Configures an existing button appropriately based on this label info's
  properties.
  
  @param button