void Recognizer_View_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "Renderer")
{
var renderer = TargetView.GetRenderer();
if (renderer != null && !_isInitialized)
{
Initialize();
}
else if (renderer == null && _isInitialized)
{
UnInitialize();
}
}
}