More sample build fixes.

* Makefile.am: reenable samples.
* sample/Actions.cs: s/Item/MenuItem, Item is dead.
* sample/NativeInstantiationTest.cs: fix dllimport, still crashes.
* sample/PolarFixed.cs: Fix size negotiation API usage, still crashes.
* sample/TreeModelDemo.cs: add ItemPrevious, still crashes.
* sample/Makefile.am: comment out some samples that don't build.

Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = sources generator parser glib gio cairo pango atk gdk gtk gtkdotnet doc
+SUBDIRS = sources generator parser glib gio cairo pango atk gdk gtk gtkdotnet sample doc
 
 EXTRA_DIST = 			\
 	gtk-sharp.snk		\

sample/Actions.cs

@@ -313,8 +313,8 @@ namespace GtkSamples {
 		{
 			if (args.Proxy is MenuItem) {
 				actions[args.Proxy] = args.Action;
-				((Item)args.Proxy).Selected += new EventHandler (OnSelect);
-				((Item)args.Proxy).Deselected += new EventHandler (OnDeselect);
+				((MenuItem)args.Proxy).Selected += new EventHandler (OnSelect);
+				((MenuItem)args.Proxy).Deselected += new EventHandler (OnDeselect);
 			}
 		}
 

sample/Makefile.am

@@ -8,7 +8,7 @@ DOTNET_TARGETS=
 DOTNET_ASSEMBLY=
 endif
 
-TARGETS = gtk-hello-world.exe button.exe calendar.exe subclass.exe menu.exe treeviewdemo.exe managedtreeviewdemo.exe nodeviewdemo.exe treemodeldemo.exe testdnd.exe actions.exe spawn.exe assistant.exe registerprop.exe gexceptiontest.exe cairo-sample.exe native-instantiation.exe polarfixed.exe custom-widget.exe custom-cellrenderer.exe scribble.exe scribble-xinput.exe $(DOTNET_TARGETS)
+TARGETS = gtk-hello-world.exe button.exe calendar.exe subclass.exe menu.exe treeviewdemo.exe managedtreeviewdemo.exe nodeviewdemo.exe treemodeldemo.exe actions.exe spawn.exe assistant.exe registerprop.exe gexceptiontest.exe native-instantiation.exe polarfixed.exe # cairo-sample.exe custom-widget.exe custom-cellrenderer.exe scribble.exe scribble-xinput.exe testdnd.exe $(DOTNET_TARGETS)
 
 DEBUGS = $(addsuffix .mdb, $(TARGETS))
 

sample/NativeInstantiationTest.cs

@@ -13,7 +13,7 @@ namespace GtkSharp {
 		[DllImport ("libgobject-2.0.so.0")]
 		static extern IntPtr g_object_new (IntPtr gtype, string prop, string val, IntPtr dummy);
 
-		[DllImport ("libgtk-x11-2.0.so.0")]
+		[DllImport ("libgtk-3.0.so.0")]
 		static extern void gtk_widget_show (IntPtr handle);
 
 		public static int Main (string[] args)

sample/PolarFixed.cs

@@ -11,7 +11,7 @@ class PolarFixed : Container {
 	public PolarFixed ()
 	{
 		children = new ArrayList ();
-		WidgetFlags |= WidgetFlags.NoWindow;
+		HasWindow = false;
 	}
 
 	// The child properties object
@@ -112,7 +112,21 @@ class PolarFixed : Container {
 	}
 
 	// Handle size request
-	protected override void OnSizeRequested (ref Requisition req)
+	protected override void OnGetPreferredHeight (out int minimal_height, out int natural_height)
+	{
+		Requisition req = new Requisition ();
+		OnSizeRequested (ref req);
+		minimal_height = natural_height = req.Height;
+	}
+
+	protected override void OnGetPreferredWidth (out int minimal_width, out int natural_width)
+	{
+		Requisition req = new Requisition ();
+		OnSizeRequested (ref req);
+		minimal_width = natural_width = req.Width;
+	}
+
+	void OnSizeRequested (ref Requisition req)
 	{
 		Requisition childReq;
 		int x, y;
@@ -171,7 +185,7 @@ class PolarFixed : Container {
 			allocation.Y = cy - y;
 			allocation.Height = childReq.Height;
 
-			pfc.Child.Allocation = allocation;
+			pfc.Child.SizeAllocate (allocation);
 		}
 	}
 }

sample/TreeModelDemo.cs

@@ -215,6 +215,37 @@ namespace GtkSamples {
 			return false;
 		}
 
+		public bool IterPrevious (ref TreeIter iter)
+		{
+			object node = NodeFromIter (iter);
+			if (node == null)
+				return false;
+
+			int idx;
+			if (node is Assembly) {
+				idx = Array.IndexOf (assemblies, node) - 1;
+				if (idx >= 0) {
+					iter = IterFromNode (assemblies [idx]);
+					return true;
+				}
+			} else if (node is Type) {
+				Type[] siblings = (node as Type).Assembly.GetTypes ();
+				idx = Array.IndexOf (siblings, node) - 1;
+				if (idx >= 0) {
+					iter = IterFromNode (siblings [idx]);
+					return true;
+				}
+			} else {
+				MemberInfo[] siblings = (node as MemberInfo).ReflectedType.GetMembers ();
+				idx = Array.IndexOf (siblings, node) - 1;
+				if (idx >= 0) {
+					iter = IterFromNode (siblings [idx]);
+					return true;
+				}
+			}
+			return false;
+		}
+
 		int ChildCount (object node)
 		{
 			if (node is Assembly)