add activate method

src/Box/Tab.php

@@ -72,7 +72,10 @@ class Tab
             true,
             0
         );
+    }
 
+    public function activate()
+    {
         $this->navigation->address->entry->connect(
             'activate',
             function ($entry)

src/Yoda.php

@@ -63,6 +63,8 @@ $window->connect(
 
 $tab = new \Yggverse\Yoda\Box\Tab();
 
+$tab->activate();
+
 $window->add(
     $tab->box
 );