The simplest solution I've come up with so far (to avoid developing my own listbox) is to use 2 of the built-in listboxes.
One lists all items NOT currently selected, the other lists all items that ARE selected. With a couple of buttons (Add/Remove) to move the single selected item from one list to the other, this should provide the same functionality as a multi-select list (but using around twice as much real estate!)
This is a fairly common layout in GUI apps, so should be familiar enough to users too.
One lists all items NOT currently selected, the other lists all items that ARE selected. With a couple of buttons (Add/Remove) to move the single selected item from one list to the other, this should provide the same functionality as a multi-select list (but using around twice as much real estate!)
This is a fairly common layout in GUI apps, so should be familiar enough to users too.