Use new DisplayDevice.GetDisplay() interface instead of obsolete AvailableDisplays.

Source/Examples/OpenTK/Test/TestResolutionChanges.cs

@@ -18,7 +18,10 @@ namespace Examples.Tests
     {
         public static void Main()
         {
-            foreach (DisplayDevice dev in DisplayDevice.AvailableDisplays)
+            for (int i = 0; i < 6; i++)
+            {
+                DisplayDevice dev = DisplayDevice.GetDisplay(DisplayIndex.First + i);
+                if (dev != null)
                 {
                     Trace.WriteLine(dev.ToString());
                     MessageBox.Show(dev.ToString());
@@ -32,3 +35,4 @@ namespace Examples.Tests
             }
         }
     }
+}