void Initialize()
{
if (_isInitialized)
{
throw new InvalidOperationException("asked to initialize coorodinator that was already intialized");
}
_nativeView = TargetView.GetNativeView();
foreach (var recognizer in NativeRecognizers)
{
recognizer.NativeView = _nativeView;
}
_nativeView.Touch += _nativeView_Touch;
_isInitialized = true;
}