Render extra content at the top of virtualized ComboboxOptions

[wyozi]

Hey, I have a virtualized ComboBox and I'd like to render a operator selector as a floating item inside the ComboboxOptions popup.

This was very easy with non-virtualized combobox by just rendering it as the first child of ComboboxOptions, but I'm having trouble doing the same with virtualized combobox. Any pointers if this is doable?