diff --git a/.ruby-version b/.ruby-version
index 2aaf252..d72af3d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-1.9.3-p392
+ruby-1.9.3-head
diff --git a/app/screens/basic_screen.rb b/app/screens/basic_screen.rb
index 4b12492..cf62686 100644
--- a/app/screens/basic_screen.rb
+++ b/app/screens/basic_screen.rb
@@ -1,3 +1,15 @@
 class BasicScreen < PM::Screen
   title "Basic"
+
+  attr_reader :animation_ts
+
+  def will_appear
+    @will_appear_ts = NSDate.date
+  end
+  
+  def on_appear
+    @on_appear_ts = NSDate.date
+    @animation_ts = @on_appear_ts - @will_appear_ts
+  end
+
 end
diff --git a/lib/ProMotion/containers/tabs.rb b/lib/ProMotion/containers/tabs.rb
index 40dfab2..c1133ac 100644
--- a/lib/ProMotion/containers/tabs.rb
+++ b/lib/ProMotion/containers/tabs.rb
@@ -35,8 +35,10 @@ module ProMotion
       return UITabBarItem.alloc.initWithTabBarSystemItem(icon, tag: tag)
     end
 
-    def create_tab_bar_icon_custom(title, image_name, tag)
-      icon_image = UIImage.imageNamed(image_name)
+    def create_tab_bar_icon_custom(title, icon_image, tag)
+      if icon_image.is_a?(String)
+        icon_image = UIImage.imageNamed(icon_image)
+      end
       return UITabBarItem.alloc.initWithTitle(title, image:icon_image, tag:tag)
     end
 
diff --git a/lib/ProMotion/screen/screen_navigation.rb b/lib/ProMotion/screen/screen_navigation.rb
index 115ba0d..a0dc362 100644
--- a/lib/ProMotion/screen/screen_navigation.rb
+++ b/lib/ProMotion/screen/screen_navigation.rb
@@ -24,7 +24,7 @@ module ProMotion
         present_view_controller_in_tab_bar_controller screen, args[:in_tab]
 
       elsif self.navigation_controller
-        push_view_controller screen
+        push_view_controller screen, self.navigation_controller, args[:animated].nil? ? true : args[:animated]
 
       else
         open_root_screen (screen.navigationController || screen)
@@ -76,14 +76,14 @@ module ProMotion
       end
     end
 
-    def push_view_controller(vc, nav_controller=nil)
+    def push_view_controller(vc, nav_controller=nil, animated=true)
       unless self.navigation_controller
         PM.logger.error "You need a nav_bar if you are going to push #{vc.to_s} onto it."
       end
       nav_controller ||= self.navigation_controller
       vc.first_screen = false if vc.respond_to?(:first_screen=)
       vc.navigation_controller = nav_controller if vc.respond_to?(:navigation_controller=)
-      nav_controller.pushViewController(vc, animated: true)
+      nav_controller.pushViewController(vc, animated: animated)
     end
 
     protected
diff --git a/spec/functional/func_screen_spec.rb b/spec/functional/func_screen_spec.rb
index d9e4c5a..d0eeb8f 100644
--- a/spec/functional/func_screen_spec.rb
+++ b/spec/functional/func_screen_spec.rb
@@ -50,8 +50,31 @@ describe "ProMotion::Screen functional" do
       end
 
     end
+    
   end
 
+  it "should push another screen with animation by default" do
+    basic = @root_screen.open BasicScreen
+    wait 0.5 do
+      basic.animation_ts.should.be > 0.2
+    end
+  end
+
+  it "should push another screen with animation when animated: true" do
+    basic = @root_screen.open BasicScreen, animated: true
+    wait 0.5 do
+      basic.animation_ts.should.be > 0.2
+    end
+  end
+
+  it "should push another screen without animation when animated: false" do
+    basic = @root_screen.open BasicScreen, animated: false
+    wait 0.5 do
+      basic.animation_ts.should.be < 0.2
+    end
+  end
+
+
   it "should allow opening and closing a modal screen" do
     @basic = BasicScreen.new(nav_bar: true)
     wait 0.1 do