The value of AnnPicture.Source is the URL to image that just finished loading
For an example, refer to AnnRenderingEngine.LoadPicture.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2