private void handleButtonEvent(final Event event){
switch (event.type) {
case SWT.FocusIn:
{
      handleFocusEvents(SWT.FocusIn);
      break;
    }
case SWT.Selection:
{
    changeVisibilityOfPopupWindow(!isDropped());
    break;
  }
}
}

private void handleButtonEvent ( final Event event ) { switch ( event . type ) { case SWT . FocusIn : { handleFocusEvents ( SWT . FocusIn ) ; break ; } case SWT . Selection : { changeVisibilityOfPopupWindow ( ! isDropped ( ) ) ; break ; } } }
handle a button event
