title: WPF: Is it possible to get all elements on which certain attached property set?
body: <p>I created a custom attached property which should be set on certain unrelated elements. Purpose of this attached property is to keep Width of all those elements the same. So when any of these elements changes width it should update all other elements with this attached property set. 
  I am able to track changes to attached property via "DP property changed event handler" set via UIPropertyMetadata so when any element changes width I will get that notification. What I need to do then is to update all other elements that have this this attached property set. </p>
  
  <p>So I was wondering is it possible to do this? Is there a way to enumerate all DependencyObject instances that have certain attached property set?</p>
  
  <p>I guess this is a bit advanced WPF stuff but it is very specific specific requirement in my WPF application.</p>