Chat Application

Hi guys,

I'm trying to create a chat application on Xamarin Forms. I've been having problems with the UI. I have created a Renderer for the ViewCell however I've been having a problem with placing the Entry under the list. When the keyboard is open the list does not scroll up like it should.

1) Does anyone have a good Xamarin Forms chat example where the entry is at the bottom?
2) If I decide to implement the whole view natively for IOS and Android, can I bind the button to the ViewModel? How do I set the 'Command' property to a UIButton?

Thanks
Shaun