Two functions for listing "stock" icons, and adding "stock" icons. A stock icon can be referenced within gWidgets by its simple name, such as "ok" or "close".
gtree
(Package: gWidgets) :
Constructor for widget to display heirarchical dta
This widget allows tree-like data to be presented. Each node on the tree should be a data frame with the same column structure. The first column is treated like a key, and should be unique. Offspring are specified through a function of the keys which are ancestors. This function returns the data frame to be displayed. Values in the tree can be selected with the mouse. This value can be retrieved through a method, or a handler can be assigned to double click events.
gwindow
(Package: gWidgets) :
Constructor for base container
Widgets are packed inside containers which may in turn be packed inside other containers. The base container is known as a window. Only one container may be packed inside a window.
gcheckboxgroup
(Package: gWidgets) :
Widget to allow multiple selection from a vector of items
Widgets to select one (or several) from a given vector of items. These are a radio group where all values are shown at once, but only one may be selected; a checkbox group where more than one may be selected; and a combo box (or droplist) where initially only a single value is shown, and the others are a mouse click away,
providing 
.