Hi Lori,
I raised a ticket before for this issue (Incident 840308 / 2015 / Design Studio Checkbox Group getHeight for internal colleagues).
What I did was:
1. create a Checkbox Group and two buttons
2. a button with script
"APPLICATION.alert(CHECKBOXGROUP_2.getHeight()+"");"
3. another button with script "CHECKBOXGROUP_2.addItem("1", "1");"
4. execute
5. the return value of getHeight() won't get refreshed
The response I got is:
"I confirmed with my DEV support team colleagues and got to know that the current behavior is by design.
The getHeight function does not work during the runtime.
The documentation will be updated about this."
Best regards,
Alfred