焦点矩形出现在VBA中的所有列表框项目上

I've created a Userform in Excel VBA, on which there is an unbound Listbox that has its MultiSelect property set to Extended. When that listbox receives focus by any means other than clicking a list item, all items in that list appear with the dotted focus rectangle around them.I've created a Userform in Excel VBA, on which