wpf - How does is the blend interaction functionality implemented? -

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out of curiosity, i'd know how blend interaction (such in following example) functionality works behind hood.

  1. is interaction kind of attached property?
  2. how have elements of control using different namespace?

does know of tutorial or goes through implementation of this? i.e how barebones wpf framework , no other frameworks

<textbox>          <i:interaction.triggers>               <i:eventtrigger eventname="lostfocus">                     ...               </i:eventtrigger>           </i:interaction.triggers> </textbox>

interaction class, triggers attached property, access attached properties, can set on control. recommend reading the documentation.


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