The specified command "TestCommand" has no associated metadata.

Hi All,

I am playing this custom command sample in our Viewer for HTML5 4.14: Geocortex Viewer for HTML5 (vertigisstudio.com)

But I got a warning message when triggered the command from feature description.
"The specified command "TestCommand" has no associated metadata.

Does anyone know how to configure metadata for a custom command?
BTW, I didn't create any view for the module, just for commands without UI.