Cannot close containers with ClickButton()

**Describe the bug**
Cannot find a way to click the Close button of containers.

**To Reproduce**
Just try with:
```
FindPanel("Container") 
if FINDPANEL then
    for panel in FINDPANEL do
        ClickButton(panel.ID, "CloseButton")
    end
end
```

**Expected behavior**

**Screenshots**

**Desktop (please complete the following information):**

**Additional context**
