Cannot set background color of extension::ScrollView

I am using extension::ScrollView in my project. When scrollview’s bounceable prop is false, there is no problem. But When I set bounceable to true. I found black area around the container layer and no way to change it’s color. Could anyone help me? Thank u in advance.

I extend ScrollView and use something like:

void MyScrollView::postInit(Color3B &colour) {
    setBounceEnabled(true);
    setBackGroundColorType(ScrollView::BackGroundColorType::SOLID);
    setBackGroundColor(colour);
}

Works with black and white backgrounds, although if the list isn’t full I typically cast an opaque full screen sprite over whatever persisted.

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Yes, JonB. ui::ScrollView do support setBackgroundColor. I have switched to use ui::ScrollView from old extension::ScrollView. Great THX