so I have been using the mentioned up command to pop up a menu.
The only way to navigate it is either by using the underlined characters or the Up/Down arrows.
I select one option, say "Usages of Symbol".
Then the only way to navigate the popped up items is by Up/Down arrows.
I find the ways of navigating these menus, inconvenient (moreover, being an Vim user, I avoid moving my hand to the Up/Down arrows).
I would suggest that at least the Tab, Shift+Tab buttons work for navigating the focused item Up/Down for such kind of menus. This is generic approach which works on all VS menus anyway.