seesaw setvisible

gistfile1.clj

(frame :resizable? true
       :content (vertical-panel
                 :id :panel
                 :items
                 [(button :text "show button 2"
                          :listen [:action (fn [e]
                                    (let [btn (select (to-frame e) [:#btn])]
                                     (.setVisible btn true)))])
                  (doto (button :id :btn :text "here I am") (.setVisible false))]))