The third video explains how to create a primary display binding that can view images:
Tutorial3.wmv (3,78 MB, 07:38m)
Again, this tutorial starts with opening the AddIn created in tutorial 1, so make sure you watch that first.
MyTestAddIn.3.zip (4,06 KB) contains the addin as it should be after following the steps in this tutorial. It uses "..\Corsavy" as relative path to the SharpDevelop checkout directory, so make sure you extract it to the correct location.