Directly you can't.
ReplaceBasePanelWithView(base, sv) replaces the base Panel by a ScrollView and you cannot add a view onto a ScrollView only in its internal Panel, but that's not what you want.
So you need to modify the CustonListView Class code.
You could keep the base Panel and instead of replacing it by the ScrollView you could add the ScrollView onto the base Panel and add your views onto the base Panel.