Add UIEffectView with Blur Effect on top of MonoGame on iOS


I have a monogame application with native iOS-Elements, like UIButton, UISlider etc.
Now, I want to embed these controls into a UIEffectView with a Blur Effect. But if I try this,
it looks good on the Simulator, but not on a real device. On real device, the effect view is not translucent.
Does anyone know how to solve this issue. It would be so great if I could use this feature.