Stop scroll box from scrolling when scrolling a combo box widget

I have setup a ScrollBox widget inside my SettingsMenu widget and i have a few containers inside the scrollbox that contain another widget which contains a combobox. When scrolling these combo boxes on smaller window sizes the scrollbox scrollbar and the combobox scrollbar overlap and scroll at the same time.

How can i ensure that even when they do overlap to some extent that only the combo box scrolls when it is open?