A selector box is displayed to the left of the label in a check-button entry. Radio-button entries are organized in groups of which only one entry may be selected at a time. This action causes any previously-selected entry in the same group to deselect itself. Once an entry has become selected, any change to the entry's associated variable will cause the entry to deselect itself. A selector diamond is displayed to the left of the label in each radio-button entry.
Cascade entries allow the construction of cascading menus.
The associated menu should normally be a child of the menu containing the cascade entry, in order for menu traversal to work correctly. The lower-level menu is unposted by executing a Tcl command with the form menu unpost where menu is the name of the associated menu. The menu command creates a new Tcl command whose name is pathName . This command may be used to invoke various operations on the widget. Option and the arg s determine the exact behavior of the command.