private void subscribeToEvents()
{
if (_switchWindowsScanner != null)
{
_switchWindowsScanner.FormClosing += _form_FormClosing;
_switchWindowsScanner.EvtDone += _form_EvtDone;
_switchWindowsScanner.EvtActivateWindow += _switchWindowsScanner_EvtActivateWindow;
_switchWindowsScanner.EvtShowScanner += switchWindows_EvtShowScanner;
}
}