This option is the same as the standard background option except that its value may also be specified as an empty string. In this case, the widget will display no background or border, and no colors will be consumed from its colormap for its background and border.
Class Specifies a class for the window.
This class will be used when querying the option database for the window's other options, and it will also be used later for other purposes such as bindings. The class option may not be changed with the configure widget command. Colormap Specifies a colormap to use for the window. If the colormap option is not specified, the new window uses the default colormap of its screen. This option may not be changed with the configure widget command.