Using Microsoft.Phone.Controls.WebBrowser in Unity3d

I have a problem to port a iOS/Android Project which use webview to Windows Phone.
I have not found a webview plugin which support Windows Phone 8, so I decide to make one.
Now I am writing a C# Class Library to create the webBrowser object, but it seems I cant attach it to the application page in the Class Library.
I have another approach, which is adding the webview in the unity3d visual studio solution.
But I dont know how to communicate with the controls added after I build the unity project.
Anyone have ideas how to use the webBrowser in unity?

 

Thank you, I save some times on fighting with the plugin dll.