https://www.dotnetzone.gr:443/cs/blogs/birbilis/archive/2012/08/09/gotcha-silverlight-dependencyproperty-metadata-0d-not-0-for-double.aspxJust came accross a runtime error message that troubled me a bit to resolve while adding Prezi-like content scaling functionality in ClipFlair‘s FloatingWindowHostZUI (ZUI = Zoomable User Interface) container. I had added the following: /// IdentifieselCommunityServer 2.1 SP3 (Build: 20423.1)