Issue
As I understand, any plug-in will be the PluginRecord in the plug-in collection of Navisworks. They are visible in Navisworks. And Options = PluginOptions.SupportsControls will make the plug-in visible to an application of .NET control. One sample code (topic PluginRecord Class) demos how to iterate the plug-ins in a control application. However the collection always returned 0 items when I tested with a .NET control application, even though I have set one of my plug-ins with SupportsControls.
Solution
Currently .NET API does not support loading plug-ins within control based solutions, so the flag SupportsControls is for now
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