Xamarin xaml design view is not displaying in visual studio

I am using Xamarin xaml in my visual studio 2013. I have installed Xamarin studio in my system.Then i open VS2013 creating a new project under Visual C#====>Mobile Apps ==>Blank App(Xamarion.Forms Portable). After that I created one xaml file but i could not see the design view in my page.I have attached the screen shot for your reference. Please kindly check this and give me a better solution to working on that.

I cannot able to see my design view in xaml page also i cannot use any toolbox items,because its all disabled.Please read this post and reply soon as possible...