title: starting with gtk# under monodevelop, Gdk.PixBuf issues
body: <p>I need to create C# application under Fedora 15. I have skills only for creating applications under Windows (Winforms or WPF), so I choose gtk# and monodevelop. It big change... 
  I have a lot of problems. At first I wanted in monodevelop to add icon for window (Main Window - Window properties. just 1 from standard gtk icons) and in MainWindow.cs and generated.cs appeared error: cannot implicitly convert type 'Gdk.PixBuf' to 'Gdk.PixBuf'. What is that? I removed icon and this error is still there...
  Next one - I wanted to add a reference, but there is just option for editing references...
  I also wanted to use Glade and compile applications with 
  <code>mcs demo.cs -pkg:gtk-sharp</code>
  and it tells me:
  <code>No package 'gtk-sharp' found
  error CS8027: Error running pkg-config.</code>
  Please, help me.</p>