Why there is no DoubleTapped event in GestureRecognizer

I'm using GestureRecognizer for handling input taps in WP8.1 app. I have different actions for single and double taps. And I need different events. I used this checking, but this not works and when I need only double tap event - works both single tap and double tap.

void RecognizerHelper::OnTapped(GestureRecognizer ^sender, TappedEventArgs ^args)
{
    if (this->DoubleTap && args->TapCount == 2) 
    {
        //make doubletap action
    }

    if (this->ManipulationStarted  && args->TapCount == 1)
    {
        //make single tap action
    }
}

Why the second condition is always true??