When I began to think about the previous post, (on automating the insertion of images into an Org Chart), I started by running the Visio Event Monitor tool while manually inserting an image using the Add-On's right click option to see the results. Rather than squeeze all of the technical explanation into the same post, I thought I'd add a second one to go into all of the gory details and also introduce the Event Monitor tool for anyone that hasn't come across it before...