               .tag("input").CLASS("rule-input").store("subrule_input").end()
             .end()
             .tag("td")
+            .tag("button").store("subrule_reverse").text("-T").a("title","Inverse sub-rule").end()          
             .tag("button").store("subrule_duplicate").text("+").a("title","Duplicate sub-rule").end()          
           #Don't add remove button, if number of rules is 1.
           if n > 1 

            #warning: mind ?, button can be absent
            dom.vars.subrule_delete?.addEventListener "click", (e) => @_removeSubRule i
            dom.vars.subrule_duplicate.addEventListener "click", (e) => @_duplicateSubRule i
            dom.vars.subrule_input.addEventListener "change", (e) => @setRuleFromControls()
            fill_rules dom.vars.subrule_select, predefinedRules
            dom.vars.subrule_select.addEventListener "change", (e) =>

        subRule = @rule.rules[index]
        @rule.rules.splice index, 0, subRule
        @set_rule @rule
        
      _reverseSubRule: (index) ->
        try
          @rule.rules[index] = @rule.rules[index].reverse()
          @set_rule @rule
        catch e
          alert "Failed to reverse rule: #{e}"
        
      _createSubRuleControls: (n) ->
        container = E "table-sub-rules"
        dom = new DomBuilder
