When to use AttachedProperties in wpf

Question

Here are my doubts,

1. When to use AttachedProperties in wpf
2. Should I use AttachedProperties only with ContentControls (like Panels) where are there one or more children
3. What is the use of AttachedProperties
4. Can I use AttachedProperties for extending properties of a control, i.e., properties that don't exists but I would like to add to the control without modifying the object hierarchy of that control

P.S.: I have already read the MSDN link on AttachedProperties, still I would like to hear the best from the stackoverflow users

Thanks

Answer 1

You can take a look at these posts that are related:

http://stackoverflow.com/questions/3195638/what-are-the-various-uses-of-attached-properties

http://stackoverflow.com/questions/1173494/how-exactly-do-attached-properties-work-in-wpf

http://stackoverflow.com/questions/1240699/whats-the-difference-between-a-dependency-property-and-an-attached-property-in-w