Can't get the PinchToZoomContainer working

I already posted this question on the general forum, but i think that it rather belongs here.
This is my original post: "Hi all!
Im quite new to Xamarin and i have been working on an App for the last 2 weeks using xamarin.forms. I need to make a page which is zoomable by a regular pinch gesture. I have tried the online example at the official xamarin.forms page(can't post links yet sorry)
This solution however will result in a white page with absolutely no content(It doesnt matter which element i set as the content of the wrapper in XAML).
P.S: it will also show me a blank page, if the Content of the page is only the wrapper and a label added manually to the content of the wrapper in the constructor, also I'm testing on all systems IOS Android and UWP"