Hello!
I'm using Visual Studio Professional 2017 Version 15.5.6 where the built-in DataTable Visualizer doesn't work ("Could not load this custom viewer") so I installed yours. Your DataTable Visualizer panel appeared when I started Visual Studio, but when I'm debugging and I try to visualize a DataTable, only the default "DataTable Visualizer" appears in the dropdown list. There is no "ShineTools.DataTableVisualizer" as expected from your instructions.

The new panel remains empty like this:
