freebsd man page for destroy

destroy(n)                                                     Tk Built-In Commands                                                     destroy(n)

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NAME
       destroy - Destroy one or more windows

SYNOPSIS
       destroy ?window window ...?
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DESCRIPTION
       This  command  deletes the windows given by the window arguments, plus all of their descendants.  If a window "."  is deleted then all win-
       dows will be destroyed and the application will (normally) exit.  The windows are destroyed in order, and if an error occurs in  destroying
       a window the command aborts without destroying the remaining windows.  No error is returned if window does not exist.

EXAMPLE
       Destroy all checkbuttons that are direct children of the given widget:
              proc killCheckbuttonChildren {parent} {
                 foreach w [winfo children $parent] {
                    if {[winfo class $w] eq "Checkbutton"} {
                       destroy $w
                    }
                 }
              }

KEYWORDS
       application, destroy, window

Tk                                                                                                                                      destroy(n)