I am working on a first PCL that targets : WSA (Windows Store Application), WPF,WP7,WP8. We can say that it is a rolerdex kind of application, you have contacts , they have
Most people have already said and the answer is also "Not possible". UI elements in PCL goes against the philosophy of PCL, which should be usable as is across platforms that you are targetting.
Here's what MSDN has to say on PCL - "the Portable Class Library project doesn't contain any UI components because of behavioral differences between the UIs of different devices" (from http://msdn.microsoft.com/en-us/library/gg597391.aspx)
hope this helps