Bug with the Picker control on Xamarin Forms?

I am working right now with Xamarin Forms and testing with Android. It seems that the Picker Control has problems, I don't know if I did something wrong, when you are going to pick an item, the style appears so weird (no background and some elements missing). Here is an screenshot:

http://grab.by/L9xS

Any idea what is happening? I am not using custom render neither an special style for the control (just theming options for material support (which is the @JamesMontemagno 's guide))

I am working on Visual Studio 2015, latest beta update and using Visual Studio Emulator for Android (I have tested this on Android 4.4 and 5.0)

Thanks in advance!