This is the parent with the state that I want one child to be able to change and that triggers the render which looks at local state and then changes

Parent with two siblings

(defn section-button-view [title-and-symbol-vector owner]
  (om/component
    (sab/html
      [:div {:style    {:color            "black"
                        :border           "1px solid grey"
                        :border-radius    "4px"
                        :padding          "5px"
                        :margin           "5px"
                        :text-align       "center"
                        :font-weight      "bold"
                        :background-color "lightgrey"
                        :font-size        "2rem"
                        }
             :on-click (fn [event]
                           (js/alert (str "Hello from " (first title-and-symbol-vector)))
                           (om/set-state! owner :section-visible (second title-and-symbol-vector))
                         )
             }
       (first  title-and-symbol-vector)])))


(defn editor-sections-buttons-view [data owner ]
  (reify
    om/IRender
    (render [this]
      (sab/html
        [:div
         ; [:h1 "Sections"]
         [:ul
          (om/build-all section-button-view   [["Basic Info & Photos"     :info]
                                               ["Amenities"               :amenities]
                                               ["Campsites"               :campsites]
                                               ["Rates"                   :ratess]
                                               ["Policies & Restrictions" :policies]]
                        )]]))))
                        
                        
(defn setup-middle [data component]
  (reify
    om/IInitState
    (init-state [_]
      {:section-visible :info})
    om/IRenderState
    (render-state [_ state]
      (sab/html
        [:div.container
         [:hr {:style {:margin "2rem"}}
         [:div.row
          [:h4.two.columns {:style {:border-style "solid"
                                    :background-color "WhiteSmoke"
                                    :border-width "1px"
                                    :padding "20px"
                                    :margin "0px"}}
           (om/build editor-sections-buttons-view data)
           ]
          [:h4.ten.columns
           (let [current-section (om/get-state component :section-visible)]
             (.log js/console "Current section is: " current-section)
             (case (name current-section)
               "info"         (om/build basic-info-and-photos-section data)
               "amenities"    (om/build amenities-section data)
               "default"      (.log js/console "Don't have this section done yet!")))
          ]]]]))))