[DllImport("libgtk-win32-2.0-0.dll")]
		static extern bool gtk_tree_model_iter_children (IntPtr raw, out Gtk.TreeIter iter, IntPtr parent);
		public bool IterChildren (out Gtk.TreeIter iter) {
			bool raw_ret = gtk_tree_model_iter_children (Handle, out iter, IntPtr.Zero);
			bool ret = raw_ret;
			return ret;
		}

		[DllImport("libgtk-win32-2.0-0.dll")]
		static extern int gtk_tree_model_iter_n_children (IntPtr raw, IntPtr iter);
		public int IterNChildren () {
			int raw_ret = gtk_tree_model_iter_n_children (Handle, IntPtr.Zero);
			int ret = raw_ret;
			return ret;
		}

		[DllImport("libgtk-win32-2.0-0.dll")]
		static extern bool gtk_tree_model_iter_nth_child (IntPtr raw, out Gtk.TreeIter iter, IntPtr parent, int n);
		public bool IterNthChild (out Gtk.TreeIter iter, int n) {
			bool raw_ret = gtk_tree_model_iter_nth_child (Handle, out iter, IntPtr.Zero, n);
			bool ret = raw_ret;
			return ret;
		}

		public void SetValue (Gtk.TreeIter iter, int column, bool value) {
			SetValue (iter, column, new GLib.Value (value));
		}

		public void SetValue (Gtk.TreeIter iter, int column, double value) {
			SetValue (iter, column, new GLib.Value (value));
		}

		public void SetValue (Gtk.TreeIter iter, int column, int value) {
			SetValue (iter, column, new GLib.Value (value));
		}

		public void SetValue (Gtk.TreeIter iter, int column, string value) {
			SetValue (iter, column, new GLib.Value (value));
		}

		public void SetValue (Gtk.TreeIter iter, int column, float value) {
			SetValue (iter, column, new GLib.Value (value));
		}

		public void SetValue (Gtk.TreeIter iter, int column, uint value) {
			SetValue (iter, column, new GLib.Value (value));
		}
		
		public void SetValue (Gtk.TreeIter iter, int column, object value) {
			SetValue (iter, column, new GLib.Value (value));
		}

		public object GetValue (Gtk.TreeIter iter, int column) {
			GLib.Value val = GLib.Value.Empty;
			GetValue (iter, column, ref val);
			object ret = val.Val;
			val.Dispose ();
			return ret;
		}

		[DllImport("libgtk-win32-2.0-0.dll")]
		static extern void gtk_tree_model_filter_set_modify_func(IntPtr raw, int n_columns, IntPtr[] types, GtkSharp.TreeModelFilterModifyFuncNative func, IntPtr data, GLib.DestroyNotify destroy);

		public void SetModifyFunc (int n_columns, GLib.GType[] types, TreeModelFilterModifyFunc func) 
		{
			GtkSharp.TreeModelFilterModifyFuncWrapper func_wrapper = new GtkSharp.TreeModelFilterModifyFuncWrapper (func);
			IntPtr[] native_types = new IntPtr [types.Length];
			for (int i = 0; i < types.Length; i++)
				native_types [i] = types [i].Val;
			GCHandle gch = GCHandle.Alloc (func_wrapper);
			gtk_tree_model_filter_set_modify_func (Handle, n_columns, native_types, func_wrapper.NativeDelegate, (IntPtr) gch, new GLib.DestroyNotify (GLib.DestroyHelper.NotifyHandler));
		}