Once I add the missing "plugins" property and add the string value, the canvas goes blank...
Steps to reproduce the problem:
add plugin code (resource file)
add textfield or combobox
add "plugins" property (as string) and set it to plugin alias (e.g. "clearbutton").
The result that was expected:
display should show panel with textfield/combobox
The result that occurs instead:
canvas goes completely blank...
Screenshot, Project, or Video:
As of right now, your custom JS code is not rendered in the Architect canvas. We are working right now to add this type of functionality. Thanks for the report though and look for this enhancement in the future!