How to preclude user-defined properties...

[Russell Bateman]

...in a custom processor.

I have a custom processor (that I wrote) and, in on-canvas 
configuration, the dialog allows the user to create custom properties. I 
have no need of any and wish to help my down-streamers by removing the 
option of creating any user-defined properties. How is this accomplished 
or what have I done unawares to enable it in the first place?