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How do you add attributes to AttachedProperty

Posted By:      Posted Date: September 21, 2010    Points: 0   Category :Windows Application
I have a designer where I add attached properties to the ModelItem. These then seem to get converted to ModelProperty which is accessed via ModelItem.Properties. How can I add attributes to these properties to make the property grid nicer. I want to add attributes like Description and Category (perhaps IsBrowsable if that is possible as well); 

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