define a custom attached property

Once we reach a basic understanding of something sophisticated like Attached Property, looking at a custom AProp implementation could bring us to the next level.

http://msdn.microsoft.com/en-us/library/cc903943(v=vs.95).aspx points out

“If your class (the Provider class) is defining the attached property strictly for use on other types, then the provider class does not need to derive from DependencyObject. But you do need a DependencyObject as the method parameter in the getter/setter.

Define your attached property as a dependency property by declaring a public static readonly field of type DependencyProperty.”

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