Symptoms
The dialog box in Smartforms Designer used to pick the ServiceObject method for building a custom SmartBox SmartObject does not expand when clicked the service object(s). This occurs when adding the second service method.
The issue occurs after upgrading to Blackpearl version 4.6.11.
Diagnoses
This is a known issue and it's fixed in latest Smartforms 4.6.11 roll-up.
Resolution
Please log a K2 support ticket to request the fix.