Hi Mark,

The first search result I saw when I did a Google search for the exact phrase in your subject "shortcut keys for navigating a list box",  gave me the following:

#973 – Keyboard Shortcuts for a ListBox

DECEMBER 17, 2013 1 COMMENT

You can use any of the following keyboard shortcuts when interacting with a ListBox at run-time (this assumes that the ListBox has keyboard focus):

Up/Down arrow keys – move to previous /next item

Page Up / Page Down – move to item on previous / next page (based on size of ListBox)

Home / End – move to first / last item in last

Enter single character – move to next item that begins with that character

Enter sequence of characters – move to next item that begins with that sequence

If the SelectionMode is Single or Extended

Moving to another item selects it (and unselects previous)

Spacebar – select the current item (if not already selected)

Ctrl + Spacebar – unselect the current item

If the SelectionMode is Multiple

Moving to another item does not select it

Spacebar toggles current item as selected/unselected

If the SelectionMode is Extended

Holding down the Shift key while moving to another item adds to selection

Best regards,

Sieghard