Xamarin.Forms 3.0: Styling apps using Cascading Style Sheets for beginners tutorial (C# - Xaml)

Introduction:

You may heard that Xamarin.Forms 3.0 introduces the ability to style an app using Cascading Style Sheets (CSS). We can create a style sheet that consists of a list of rules, with each rule consisting of one or more selectors and a declaration block. A declaration block consists of a list of declarations in braces, with each declaration consisting of a property, a colon, and a value. When there are multiple declarations in a block, a semi-colon is inserted as a separator.

Customizing Default RadioButton and CheckBoxes with our images in WindowsPhone C#

Generally it is not possible to set default radiobuttons and checkbox border , pressed state colors in windows phone using xaml,So we need to override the template of both radiobutton & checkboxes grid template.And so we may need to make customizable controls in some requirement with respect of our images.And it is best practice for if client want to know control pressed state with proper image background selection. And for our requirement, expression blend is best suitable tool for customizing radio button s as well as checkboxes and off course it is very flexible for generating customizable xaml of our app UI.
Note:
1)This sample is targeted on  windows phone 7.1
2)Here I am using expression blend 2012 which is comes under wp8 sdk.