Container doesn't collapse from script method

[Mathieu Delquignies]

Environment

• OS: Win 10 pro
• Version 1.9

Describe the bug
Container doesn't collapse from script.
The arrow changed, but not the container

To Reproduce
Steps to reproduce the behavior:

1. With DS100 module for example
2. Click "Get Scenes" (or any other "Get" module parameter, as they all should un-collapse their respective container)
3. Check the "Scenes" Container : the arrow changes from ">" to "v" but the container is still collapsed
4. Work around : you click
   
   on arrow with mouse twice, it will un-collapse

Expected behavior
collapse method should change arrow and also un-collapse the container

Additional context
Add any other context about the problem here.