# prefsave: pops up a dialog box asking confirmation from user about saving
#           current setup in xpbs.
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proc prefsave {} {

     global LABELFONT prefSaveDialogBox

     set prefSaveDialogBox ".prefsave" 
     set dbox [popupDialogBox $prefSaveDialogBox "Save Preference Settings"]
     set dbox_top    [lindex $dbox 0]
     set dbox_bottom [lindex $dbox 1]

     message $dbox_top.msg    -borderwidth 2  -justify left -font $LABELFONT \
      -aspect 2000 -text \
      "Save current xpbs settings to your ~/.xpbsrc file?"

     pack $dbox_top.msg -padx 3m -pady 3m

     set buttons [buildCmdButtons $dbox_bottom {{{yes yes} {no no}}} x 0 10 3]
     set yes_button [lindex $buttons 1]
     set no_button [lindex $buttons 2]

     $yes_button configure -command {PrefSave; destroy $prefSaveDialogBox}
     $no_button configure -command [list destroy $prefSaveDialogBox]

     register_default_action $prefSaveDialogBox $yes_button
     tkwait window $prefSaveDialogBox
}