     hasChanged: (props, state) ->
         (props.lastUpdate and props.lastUpdate isnt state.date) or false
 
+    resetChange: ->
+        delete @props.lastUpdate
+
     componentWillUnmount: ->
         @closeSaveDraft @state, hasChanged: @hasChanged(@props, @state)
 

        return if @isNew()

        doDelete = =>
            messageID = @state.id
            MessageActionCreator.delete {messageID}
            LayoutActionCreator.hideModal()

        else
            confirmMessage = t 'mail confirm delete nosubject'

        @showModal
            title       : t 'mail confirm delete title'
            subtitle    : confirmMessage
            closeLabel  : t 'mail confirm delete cancel'
            actionLabel : t 'mail confirm delete delete'
        , @finalRedirect

    toggleField: (event) ->
        ref = event.currentTarget.getAttribute 'data-ref'
