Thee combo box is another fairly simple widget that is really just
a collection of other widgets. From the user's point of view, the
widget consists of a text entry box and a pull down menu from which
the user can select one of a set of predefined
entries. Alternatively, the user can type a different option
directly into the text box.
The combo box has two principal parts that you as the programmer
really care about: The W(entry) and the W(list).
GTK.Combo()
GTK.ColorSelectionDialog()->get_ok_button()