gtk-sharp 2.6.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. An HBox is a specific type of for packing widgets horizontally. using System; using Gtk; class HBoxTester { static void Main () { Application.Init (); Window myWindow = new Window ("HBox Widget"); HBox myBox = new HBox (false, 4); //Add some buttons to the horizontal box AddButton (myBox); AddButton (myBox); //Add the box to a Window container myWindow.Add (myBox); myWindow.ShowAll (); Application.Run (); } static void AddButton (HBox box) { box.PackStart (new Button ("Button"), true, false, 0); } } Other ways of laying out widgets include using a vertical box, (see ), a table, (see ), button boxes, etc. Useful methods for manipulating boxes can be found in the superclass for HBox, . Gtk.Box Constructor Internal constructor Pointer to the C object. This is an internal constructor, and should not be used by user code. Constructor The main way to create a new HBox. If , all widgets in the box are forced to be equally sized. The number of pixels to place between each widget in the box. Property GLib.GType GType Property. a Returns the native value for . Constructor Protected Constructor. a Chain to this constructor if you have manually registered a native value for your subclass. System.Obsolete(Message=null, IsError=False) Constructor Default constructor.