diff --git a/src/js/__tests__/GlobalStateStore.spec.js b/src/js/__tests__/GlobalStateStore.spec.js
index 7a07260d..c2590946 100644
--- a/src/js/__tests__/GlobalStateStore.spec.js
+++ b/src/js/__tests__/GlobalStateStore.spec.js
@@ -10,4 +10,12 @@ describe('this store', function() {
     expect(GlobalStateStore.getIsAnimating()).toEqual(false);
   });
 
+  it('can change flip treey', function() {
+    expect(GlobalStateStore.getFlipTreeY()).toEqual(false);
+    GlobalStateActions.changeFlipTreeY(true);
+    expect(GlobalStateStore.getFlipTreeY()).toEqual(true);
+    GlobalStateActions.changeFlipTreeY(false);
+    expect(GlobalStateStore.getFlipTreeY()).toEqual(false);
+  });
+
 });
diff --git a/src/js/actions/GlobalStateActions.js b/src/js/actions/GlobalStateActions.js
index f21fdb2c..58f3f121 100644
--- a/src/js/actions/GlobalStateActions.js
+++ b/src/js/actions/GlobalStateActions.js
@@ -12,6 +12,13 @@ var GlobalStateActions = {
       type: ActionTypes.CHANGE_IS_ANIMATING,
       isAnimating: isAnimating
     });
+  },
+
+  changeFlipTreeY: function(flipTreeY) {
+    AppDispatcher.handleViewAction({
+      type: ActionTypes.CHANGE_FLIP_TREE_Y,
+      flipTreeY: flipTreeY
+    });
   }
 
 };
diff --git a/src/js/constants/AppConstants.js b/src/js/constants/AppConstants.js
index 2469ed28..c8992247 100644
--- a/src/js/constants/AppConstants.js
+++ b/src/js/constants/AppConstants.js
@@ -20,6 +20,7 @@ module.exports = {
 
   ActionTypes: keyMirror({
     CHANGE_IS_ANIMATING: null,
+    CHANGE_FLIP_TREE_Y: null,
     SUBMIT_COMMAND: null,
     CHANGE_LOCALE: null,
     CHANGE_LOCALE_FROM_HEADER: null
diff --git a/src/js/stores/GlobalStateStore.js b/src/js/stores/GlobalStateStore.js
index c93b4131..03215072 100644
--- a/src/js/stores/GlobalStateStore.js
+++ b/src/js/stores/GlobalStateStore.js
@@ -9,6 +9,7 @@ var assign = require('object-assign');
 var ActionTypes = AppConstants.ActionTypes;
 
 var _isAnimating = false;
+var _flipTreeY = false;
 
 var GlobalStateStore = assign(
 {},
@@ -19,6 +20,10 @@ AppConstants.StoreSubscribePrototype,
     return _isAnimating;
   },
 
+  getFlipTreeY: function() {
+    return _flipTreeY;
+  },
+
   dispatchToken: AppDispatcher.register(function(payload) {
     var action = payload.action;
     var shouldInform = false;
@@ -29,6 +34,8 @@ AppConstants.StoreSubscribePrototype,
         shouldInform = true;
         break;
       case ActionTypes.CHANGE_FLIP_TREE_Y:
+        _flipTreeY = action.flipTreeY;
+        shouldInform = true;
         break;
     }