Xamarin.Forms Picker Default Value

I have date picker and i am populating it dynamically via a web service.

<Picker x:Name="picker" Title="Select Something" ItemsSource="{Binding}" ItemDisplayBinding="{Binding Name}"></Picker>

I set the Title property as above but for UWP it shows up as a Label. How can i set it as a default value/prompt for UWP ?

Any help would be appreciated.