How to close DOS window?

I wrote a simple tk script that I can use to invoke a backup (from a
DOS batch file). It works great but when the backup is complete I'd
like to close out the DOS window. I'm pretty new to tcl/tk so I don't
know if it's a switch option (like /MIN to minimize the DOS window) or
if I have to use | to look for some feedback and then send some
command to close the window that way.

Sorry for the noob question, but I did a search and didn't find
anything appropriate (that I could understand).
Here's the script:

wm title . "Backup"
frame .top -borderwidth 20
set backup {"C:/Robocopy/backup.bat" &}
button .top.but1 -text "Backup" -command {eval exec [auto_exe***
start] $backup; destroy .} -width 10
button .top.but2 -text "Quit" -command {destroy .} -width 10
pack .top .top.but1 .top.but2 -side top


Again all I need is to call an MS-DOS batch file (I'm running WinXP)
then close the DOS window when it's done with the backup. Right now
everything works but the DOS CMD window stays open and I manually have
to close it. Thanks in advance.
.

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