title: Mono - GTK (Linux) / Cocoa (Mac OS) in one Solution?
body: <p>It's possible to create project (solution in mono) when before build for target OS is decided what GUI use? </p>
  
  <p>I have:</p>
  
  <ul>
  <li>Windows - C# WinForms</li>
  <li>Linux - C# Winforms -> GTK+</li>
  <li>MacOS X - C# GTK+ but I want to replace it with Cocoa binds</li>
  </ul>
  
  <p>its possible to have this in one solution? </p>