Symptoms

How to update a custom control
 

Diagnoses

N/A
 

Resolution

You only need to use controlutil to register the control once, and then again whenever the control type definition XML file changes.

If you do make changes to a custom control, you must rebuild and then copy the resulting assembly to both the K2 Designer and Runtime servers, restart IIS and clear your browser cache to pick up the changes to the control

https://help.k2.com/onlinehelp/k2smartforms/devref/current/default.htm_Using_controlutil.exe.html?TocPath=Custom Controls|Getting started with Custom Controls|_____3

The new version of the control was re-registered using the below parameters, as the K2 app server and web server were on different machines:

controlutil.exe register -assembly:"C:Program Files (x86)K2 blackpearlK2 SmartForms DesignerinCustomControl.dll" -host:DLX -port:5555