title: how to access the methods in iOS/Android projects code from PCL project
body: <p>In my Xamarin Studio for MAC I use "Xamarin.Forms" solution. I've 3 projects. PCL , iOS and Android.
  I've a proxyclass (webservice class) which I copied the file "checkServices.cs" into the iOS and Android projects. I also added the System.Web.Webservices reference in the "iOS" and "Android" project.</p>
  
  <p>The PCL is referenced in iOS and in Android, but can not reference vice versa. The sharing is only single way. from PCL --> iOS/Andoroid!</p>
  
  <p>Now how can I call these methods from my PCL to put the data on XAML page ? I like to call the methods from PCL which are located in iOS/Android project folder.</p>